I really like what you did here — it’s super entertaining and fun!
The only issue I noticed was with the upgrade system :/ The first three runs, I tried to use it actively and couldn’t get past wave 3. Then, when I completely ignored it, I reached wave 10 easily… and when I tried using upgrades again, I lost.
Maybe the upgrades are a bit too weak or too expensive, but it felt counterintuitive that avoiding that system gave me better results.
Other than that, I really enjoyed everything else — the music, the style, the sounds. It’s all really well made :) Great job!