Great job for your first entry! Visuals are very good, sound design too; I really liked the atmosphere, and the overall idea behind it, though I didn't manage to finish the game.
I didn't quite get what the cameras are for. They almost always show only a small snippet near an edge (pic), and my brain just doesn't connect what's on the monitor with where it's supposed to be around the sub. Also, there may be a bug with the sonar? At one point it just stops responding to spacebar, despite being 'good'.
