I found the controls felt good but it was a bit hard to actually dodge the bullets, although i found it quite possible to just face tank them (as long as i didnt tank too many) to get through the levels.
I tried spending a bunch of score to buy upgrades really early on and barely survived but from that point on i didnt have anything to spend on so waves were pretty easy until the last one. One thing I would suggest is to make the upgrades a bit more interesting than minor number changes but i understand that could have just been a time constraint.
If you worked a bit on presentation and balancing it out a bit I think this could be a pretty nice game haha