Left Click - Place Tower

Shift Click - Merge towers

Space - Sound menu

O - Disable Shaders

Mouse wheel - zoom in and out

Music - Made by Me

Sound effects - Generated in game

I ran out of time unfortunately, but may keep going with this game.

I made it to wave 23.  Still not sure the best way to approach the game as I couldn't balance it fully in the time I had.  I think putting frost towers on the outside helps