A charming little game :)
The spritework is ok, but the enemies blend a little into a pulpy mass, I'd give them some interesting sprite shaders or something, to spice things up. The sound design was pretty good. Mechanically there isn't too much going on, but it's enough to be engaging in a minimal way. The shooting lacks a proper punch to be satisfied with this simple thing, but still, the knockback feels very good. It's a shame that spamming reds is kinda the optimal way to play, trying to save the blue laser is usually too much of a risk for it's reward.
Great job making this game happen!