Gotta say, I love wave-based games like this, it was really fun! I enjoyed the simple but effective upgrades and the pixelated visuals added a lot of charm.
I did run into a few issues though:
UI bugs: Some text would shrink, change size, or overlap. The upgrade shop’s button hitbox also felt off, but once I found the right spot it worked, but it was a bit tricky. It’d also be nice if the game paused during upgrades, since I kept accidentally shooting (which made later waves tougher to manage, haha).

also the red “damage” overlay sometimes stuck around long after being hit, even between waves.

Wave issue: On wave 6, it wouldn’t progress; not sure if that’s the end or a bug. The yellow text on the left was hard to read too.
Overall, this was a pretty solid and fun game! With some polish on the UI and maybe more enemy variety, this could be a really great wave defense experience. Nice work! <3