I'll start with the biggest positives:
I like the procedural level generation, and I like the sound effects. I mean, really, the procedural generation sometimes doesn't feel entirely procedural even, it's pretty neat.
Also a rather ambitious idea to make something with procedural generation in such a short time span.
The shooting in the game actually feels pretty nice with how fast the bullets are.
The upgrade mechanics seem pretty neat, even if I haven't been able to get all of them yet and thus can't comment on the quality of all the upgrades.
The game controls pretty nicely, with fast and responsive movement feeling rather nice.
Not everything I have to say is positive, so I'll do my best to voice those issues in a constructive way, since it sounds like you wanted feedback:
The homing projectiles are a bit annoying (that might be something of an understatement, any room with too many homing projectile enemies pretty much requires you to stand at a distance and attempt to snipe them), I feel like just having the enemies simply shoot projectiles that moved in a straight line would have been more fun. Maybe I'm just doing something wrong but I admittedly wasn't able to beat the game because of it. Maybe I just suck at the game though. XD
I also wish the enemies were a bit more common, because like I said earlier the shooting mechanics are a decent amount of fun. I tried using the dash but it doesn't seem to do anything but leave blue particles behind, I tried holding the button and nothing seemed to happen at all. I'm probably just doing something wrong though, heh.
Even with the negatives in mind I overall liked it! Would definitely love to see a more polished version some day.