Yeah, I tried editing the code you posted on GitHub, but sound didn't work for some reason it showed a lot of errors. The game design looks very cool. I would love to see another one of these games with actual submarine sprites instead of just shapes. I played on Linux (Mint), and on Android phone. Just want to say, this is a very unique concept for a submarine game. I saw there is a little graph in the corner that shows depth, maybe that can be used so ai can't see you when you are deep and it is higher. Good luck if you decide to rework this game. ;)