@Hilscher: You can activate survival mode at any time, so I'd suggest a prompt for survival mode after activating totems. Or maybe let us keep playing after totems are up, letting up hit survival mode after we're actually ready.
Good game.
1) Hotkeys.
2) Make some way to make the "Love Demonrift TD? Please support us by rating this game. Click this message to dismiss." go away. I didn't notice it until I was a few levels in, and now it won't go away.