I seem to be unable to actually rate the game, I don't know if that's a bug with the site or if you forgot to enable some kind of option on your project's page. Either way, the gameplay itself is pretty basic, but it does have potential. I like the detailed screen that pops up when you deliver space dust to an exit, but I'm not a fan of the font. I would recommend flushing out the UI and adding in a custom font. A mini-map would also do some good since there is no real way to tell where you are since everything around you is just black. Also, I do like the upgrade system, but I would've added a few more upgrade options to keep things interesting. Finally, I would recommend giving the ship some kind of laser or cannon, so that it can fight back against the enemies.
I think I also encountered a bug where if you fly below the green exit object after completing a run (into the gray area) and then fly back up to it, it triggers the completion popup again and all of the space dust seems to disappear.
Honestly this isn't too bad for a first jam game, but I would recommend working on the enemy graphics, UI, adding some music and sounds, and adding a bit more to the gameplay.