There doesn’t seem to be more than 2 music themes in the game; one above ground theme, and one underground theme (you can warp between the two using the grey holes (?) located at random intervals). There’s no boss music either. Both of the themes seem way too cheery, as if this game was a self-caricature. Speaking of bosses, there only seems to be one; a robotic hydra looking thing. I’ve never made it all the way through the game, so I wouldn’t know if there is anything beyond, but after about 15 minutes of gameplay I encountered the same hydra twice.
The upgrades in this game are kind of funny as well. You basically start as a little ship, and you can gain up to 3 upgrades; a torso attachment, a leg attachment, and some kind of stomach beam attachment. When you have all of the upgrades you can take more hits, but unfortunately you also become larger and thus a bigger target. What a strange game.
Check out the gameplay footage, if you want.
If you’d like to check it out, you can still pick up a copy.