Thanks for the feedback about the sound! It was meant to be lot more full as a soundscape - every bit of fauna and flora making sounds, the sub creaking under pressure, a more fleshed out engine sound etc. but we had originally been planning to do a webgl build so I had to cut down on the number of voices at the last minute since it was causing a lot of lag. Although that didn't end up working out, annoyingly, so I'm hoping to put a bit more back in. There was a lot we would love to add to this game - hopefully we'll be able to develop it further though.