Quite an impressive presentation ! Graphics work really well and gameplay is pretty intuitive and fun. I agree that a bit more diversity in sound ambiances and effects would have been nice but overall it's very decent.
I like the attention to some neat details like the degrees display or the fact that the ship turns faster if you slow down.
I would say though that as it is, the experience feels a bit too long for the variety present. After the first couple of times the monster attacks get less tense as you figure out how to react and since no new event happens to shake things up it didn't (for me at least) rise up again. That is quite understandable for a gam jam though :)