Left/Right: Move
Up/Down: Aim
Space: fire (hold to charge)
F2: Reset/Restart level
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This game was made in a weekend at a private game jam, by me.
The game does not utilize any game engine. Each pixel is calculated every frame (this is known as a cellular atomata. As you might note on your computers fan speed, it uses up quite a lot cpu time.
The game is written in C++ using SDL2 and compiled with Emscripten.