A really awesome game! Even though it uses more than just two colors (in the opening sequence), it's really fun and fits the theme wonderfully with the light from your submarine illuminating the darkness of the 1-bit abyss. It's also quite an interesting concept of the 1-bit abyss being just a "regular" part of the ocean. So, an amazing game, really loved it and hope you'll keep up the good work!
(Also, really love the detail of the submarine flipping all the way around when changing direction.)