That's a really good suggestion. Since I made this for the Godot Wild Jam #50 I didn't really have much time to balance everything, but I definitely feel like changing up waves, adding new enemy AI, and different attacks (while also taking more time to balance things, and create better wave structures) will make the game feel a lot better.
specifically i think the bone throwing skulls cause the player to just run around in circles, especially in earlier eaves when the player hasn't had a chance for any speed upgrades.
Sorry for rambling haha.
Thank you so much for playing my game, and for the great feedback!