I couldn't get the waves to start after 11 and the shop is not balanced well (50% more cash = 500% more damage), but the actual gameplay and art is pretty good. The music is fine until you notice the loop and the game overall could use more sound effects, but for a 1-2 man project done it a week it's pretty decent.
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Interessting feedback for the shop! Very much appreciated. By the way, the waves are not represented as decimal numbers but as roman numbers: I, II, III, IV, V. So you were at wave 2. As for the sound effects, the webgl version in browser causes some sound fx to play at very very low volume, you should try the downloadable version! Finally for the bug (waves not starting) I added a new section on the itch.io page explaining how to avoid them! Thanks :D