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