This game got everything a TD needs in my opinion - Achievements, Upgrades, endless mode as well as a normal mode. Data about the waves incoming, and a nice tutorial. Those who read the tutorial will get a good introduction to the game.
Two things, though - The Trap / Unit immune creeps are a pain in the butt and I think it misses an option to toggle the automatic send of waves on/off for the endless mode. You should probably add these in the future.
Anyway, 5/5 and faved.