An Auto-Send Next Wave button would be awesome. My 1 tower can kill all enemies before they reached the first corner, and having to wait for the wave to finish to send the next one for X waves until next upgrade is kinda.. boring :)
It looks like I'm to stupid to find out how-to let things auto-build. Could anyone please message me with how-to? And this even after I played through all 3 campaigns, darwinmode wave 30+ and all challenges on expert....