Totally loved the game. The best part for me was that lost feeling at the beginning and then the bullets appeared and the underwater creatures. The ambient sound effects only added to the gameplay. I actually have played a very similar game but while that was more like energetic and thrilling experience, I must admit that I totally loved your muted and calm version. Kudos! Also those crawling fish creatures loo totally breathtaking.
The controls seemed a bit snoopy at first but I totally understand how that emphasizes the gameplay and kinda gives you an underwater vibe.