I love the art in this game, concept looks to be a fun one, and the music is nice, too. The balloons are very cool and the shooting/damage functionality worked well. When I first loaded in Firefox it took an exceptionally long time to load (all Godot games take some time, but this was more than usual), and when I pushed "start" at the start screen, it crashed my browser. I then tried it in Safari, and it loaded more quickly and I played to about the fifth wave or so, and then it crashed that browser, so that's as far as I got. It's not a problem I've ever had in Itch, that I can remember.
Gameplay-wise, for what my brief experience is worth, after each round I hit the plus buttons to try to buy stuff but I wasn't amassing any of the balls that appear to act as currency, so I never saw the tetris-block functionality, canons, etc. Perhaps I just didn't make it far enough. Not much feedback, but I hope it could be helpful!