Thank you so much for your feedback!
Sfx 100% need to be improved, the only sfx I personally think are ok are the upgrade sound and maybe coin collection 😅 And, technically, the dollar sign should have been replaced with the icon of a point, but alas, I delayed learning how to include icons in text until the very last minute, and then I ran out of time. Your feedback about health upgrade is a very common and very important feedback point - thisis something I will be looking into first thing once I pick up the development of this game again.
Once again thank you for your feedback, and thank you for playing!