It's endless. I wanted to add some final boss but the JAM is over :(
Ah okay. Then I don't try further to beat the game :-)
I think it's pretty good. The only thing I disliked a bit is the fact that, at some point, if you get hit, you have pretty much no chance to recover your powerups. This feels bad because on the one hand, you are basically dead already by a one hit (which is fine), but on the other hand, you're left still fighting without seeing any chance to recover. It's like when in a platformer, you land on a low platform where you cannot get back up to the main level and you are forced to jump to death - just not so great.
Oh, and a highscore system would be great as the game is endless!
Apart from that, it's quite enjoyable. Good job!