Check it out!
Steam for Windows, Linux and macOS

SHOOT 'EM UP! Battle Marine is a simple naval barrage STG. A barrage of intense shots! Shoot 'em up! Shoot 'em up! Chain bombs with detonation, powerful laser sweeps, and jumps to collect medals! Enjoy a RETRO but NEW and exhilarating STG experience!

Overview

Battle Marine is a simple naval barrage STG.
Enjoy a somewhat retro yet new and exhilarating game experience by firing a barrage of shots, inducing explosions, sweeping with powerful lasers, and automatically collecting medals (recovery and score) by jumping.
Destroying enemies consecutively within a certain time frame will result in a HIT combo. Aim for 999 HITs!
Your rank will be assessed according to the results of your play. Aim for the rank of FLEET ADMIRAL!

Controls

This game can be played with a gamepad or keyboard.

Use the cursor keys to move left and right, press B to shoot, and A to jump.
Press and hold the B button to charge the laser, and release it when the charge is maxed out to fire the laser.
Press A briefly for small jumps and long for large jumps.
Button assignments can be freely customized in the SteamInput menu.

Keyboard Controls (Windows)

• Cursor key: D-Pad (Can be changed in the key configuration)
• X key: A button (Can be changed in the key configuration)
• Z key: B button (Can be changed in the key configuration)
• Space key: START button (Can be changed in the key configuration)
• ESC key: SELECT button (Can be changed in the key configuration)
• CTRL+X: Exit the game (CTRL+Q, CTRL+C also work)
• CTRL+R: Reset
• Alt+Enter: Toggle full screen (CTRL+F also work)
• CTRL+A: Toggle screen aspect mode
• CTRL+S: Screen Resolution Settings
• CTRL+K: Key configuration for the Keyboard

Keyboard Controls (Linux/macOS)

• Cursor key: D-Pad
• X key: A button
• Z key: B button
• Space key: START button
• ESC key: SELECT button
• Q: Exit the game
• R: Reset

Notes on the Linux/macOS version

• Supported screen displays are for Full-Screen and Aspect-Fit only.
• Keyboard input key assignments cannot be changed.

Detailed Gameplay

• When you destroy an enemy, a green or red medal will appear.
• Taking the green medal will restore your LIFE.
• Your score will increase if you take a red medal.
• If you keep defeating enemies within a certain time (120 frames), your combo will increase and medals will be collected automatically when you reach 100 HITs or more.
• Medals are also automatically collected by jumping.
• You are invincible during the laser (after the firing motion is complete).
• Unlike normal STGs, explosions also have hit points.
• If you keep collecting green medals while your LIFE is full, the red medal's base points will continue to increase.
• The number of crowns at the bottom of the screen will increase for every 16 green medals you take while your LIFE is full.
• The maximum number of crowns displayed is 30 (480 green medals), but the maximum number of crowns is 4,095 (65,535 green medals).
• When you collide with enemy bullets, your LIFE will be reduced and the number of crowns will be strongly reduced.
• With the exception of some enemies (crabs), red medals will appear when enemies are killed by lasers.
• Obtaining a medal also resets the combo duration to 120 frames

Try it for FREE

The Steam version of Battle Marine is only available for a fee, but if you have a Raspberry Pi Zero 2W you can try the Raspberry Pi version for FREE.
If you like the Raspberry Pi version, please consider purchasing the Steam version.

Video distribution, etc.

There are no restrictions on the distribution of this game on TV, YouTube, or other video distribution sites.
Of course, there are no restrictions on monetization.
There is no need to contact the author prior to or after the event.
Similarly, there are no restrictions on publishing screenshots in magazines, web media, social media, etc.

Support

• Twitter: https://twitter.com/suzukiplan
• GitHub: https://github.com/suzukiplan/bmarine-zero/issues

About VGS-Zero

This game is made with the SDK called VGS-Zero.
VGS-Zero is a virtual game machine with a powerful 16MHz Z80 CPU, old-fashioned VDP (Video Display Processor) and VGS (chip-tuned sound system).
There may be many 8-bit style games, but the games made with VGS-Zero are real 8-bit games.
If you want to develop games like Battle Marine, please try to develop games with VGS-Zero.
Games you develop with VGS-Zero can be sold on Steam (Windows, Linux and macOS) using the VGS-Zero SDK for Steam.

Using OSS

• PicoJSON - a C++ JSON parser / serializer
• Copyright (c) 2009-2010 Cybozu Labs, Inc.
• Copyright (c) 2011-2015 Kazuho Oku
• SUZUKI PLAN - Z80 Emulator
• Copyright (c) 2019, Yoji Suzuki
• Simple DirectMedia Layer
• Copyright (c) 1997-2024 Sam Lantinga <slouken@libsdl.org>

PicoJSON - a C++ JSON parser / serializer

Copyright 2009-2010 Cybozu Labs, Inc.
Copyright 2011-2014 Kazuho Oku
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

SUZUKI PLAN - Z80 Emulator

The MIT License (MIT)

Copyright (c) 2019 Yoji Suzuki.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Simple DirectMedia Layer

Copyright (C) 1997-2024 Sam Lantinga 
  
This software is provided 'as-is', without any express or implied warranty.  In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
    
1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 

2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.