Very high quality stuff, as usual! The fact that you make such high quality products with pygame is inspiring :) The art is great (especially the hero), the music fitting, and having to pick the worst upgrade for your enemy is a fun mechanic (could be more fun with more upgrade variety but that’s asking for too much in a game jam). I also had more success playing it slow rather than slinging all aliens up, and at some point after having to upgrade the hero’s aim he was pretty impossible to reach. Overall though, super polished entry with impressive gameplay and variety!