Seriously good start to a shmup, but it needs more. More enemy variety, more upgrade options, bosses, a background.
That said, the enemy graphics are quite good, what is there is interesting, and I love little autonomous floaty drones/bits/options. Keep working on this, it could be really great with some more effort; as is, it is pretty good.

I liked it. Controls were ultra smooth, tune was catchy, the ships looked fantastic, and the lack of background can be forgiven on account of the impeccable framerate. At least half of the upgrade system was solid; I can't speak to any of the defensive ones because I didn't bother with them at all, but I can say for certain it was quite fun to keep on increasing my bullet count. I'm a sucker for modules/options/pods/floaty, orbity dealies that help me shoot things. The game kept me interested and engaged the whole way through, and I thought the laser ships were a nice touch that added a bit more variety and action. I ended with 30 dmg, 3 cannons and 6 modules, after wave 35. And then I played wave 36 so I could hear the song again. My only disappointments were the lack of boss battles, and the fact that new enemy types stopped appearing too soon for my liking. As far as possible improvement goes, addressing those things would be great for starters. Also, I noticed there's no graphic or sound that alerts you to the fact that you've just taken damage. Other than those hangups, you've got a really simple, solid game here. I wouldn't say it necessarily needs improvement, but if you do decide to carry further on with this, you've got a great foundation and I'm sure whatever it becomes would be fantastic. Mind you, I know nothing about this "construct 2 touch" jam, so... Yep. Just reviewing the game as I see it, and I like what I see.