Would be better if there was more interaction. Sending extra creeps seems to be a waste of money which makes it a matter of who makes the first disastrous mistake.
Less than great. Survival mode isn't fun. It's just hoping the bad guys don't pile up while you desperately try to finish off the one you're working on. Just to add fun, sometimes they hit you after you kill them.
 "Epic Coaster"){kind=icon}
 "Super Energy Apocalypse : RECYCLED!"){kind=icon}
 "Starland Multiplayer TD"){kind=icon}
 "Achilles"){kind=icon}