To be quite honest, your game doesn't have a bad little soundtrack for what it is.
The problem is (and is likely also the reason why you're not getting any replies) that you didn't ask what sort of feedback you wanted, or on what games.
That said, I'll just give a roundabout impression of the one I played (I'm warning you, I'll be brutally honest here, so don't read the next line if you don't want honest feedback!)
One thing that kills the game almost immediately is the pixel-art & digital-painting mix in the in-game sprites. The pixel size is huge on some of the sprites like the submarine, and ultra-tiny on everything else. It really looks cheap. Granted, you can't beat free, but at the same time, even free games have competition because there are so many of them.
If it looks like you grabbed sprites from the internet and threw them in a game, you probably did (at least in the player's mind), and they'll likely uninstall your game as quick as they look at it. If your revenue is advertisement, you wont get people playing long enough to see more than one ad imo, much less click on them.
That said, your game has a good pace to it, the music's nice (as mentioned before), but everything else looks so poor and low-quality that a potentially fun game is ruined. You need consistency in your art assets, otherwise you really won't get anywhere with this.
Hope that helps. If you need any art in the future, feel free to PM me. I don't mind giving you a hand. You sound like decent developers.
