It's cute, and I found it very relaxing. The slow pacing, and gradual controls make just moving around and exploring feel pretty satisfying.

Really empty, but I always like the feel of being a ship exploring the depths.

I thought that the feel was really good, the simple audio and the "big, slow" feel to the controls conveyed the underwater/driving a submarine feel pretty well. Nicely done!

I guess it's kind of nitpicky but I didn't like that you could jump out of the water, it felt a bit wrong to me, especially since you start close to the surface it's easy to accidentally jump out of the water and it felt weird.

Overall nice feel!

The sky looks nicer than the underwater tiles, but the game is ok. I did a circle around the map and missed a few gold pieces, and didn't really want to go around again to figure out where I hadn't been.

The basic gameplay is too shallow even for 48 hours. Sorry. Are levels generated procedurally? If so, then its a little bit better.

:) Feels rewarding, you should are more stuff to the game.

Very nice feel to the game!

Great mood. The gameplay was lacking, but considering everything, the game still managed to evoke some feeling of serenity with the smooth controls and lovely music.

Super chill, I like how the sound changes when you jump out of the water, nice touch!

It has a nice feel to it, and the music fits quite well (even though it's a very short loop - could have maybe put a slow bassline under it). There are some nice touches like the sound changing above the surface, but some extra little bits of juice would have really helped the feel (e.g. maybe off the walls a little instead of just stopping).

It could be a good idea in a game like this to add more coins than the player actually needs to collect. That way they aren't left searching every inch of the level for the last coin.

It has potential!

Thanks so much guys for all of the comments, I really appreciate it!

Very nice music mathing game :) I relaxed.

Very simple, but in my opinion a bit too simple (is there endles oxygene in that submarine?). Anyway, the music is awesome!

It is very cute.

Cute and calming. Sounds and music was nice :)

The music got repetitive quickly, but I think that with a long, evolving ambient track instead, the beauty in the simplicity would this a great casual game.

The game feels a bit "empty". I think some traps (like mines) and a few cosmetic elements, like fish swimming around and bubbles going up, would solve that. The controls are good, though.

A bit lacking on the challenge/complexity side, but very relaxing :)

The controls were a little weird to get used to, but other than that, cool game.

Simple but well done game. I included it in part 23 of my Ludum Dare compilation video series, if you'd like to check it out :) http://youtu.be/yJ4mg8nxxfM