Inability to reclaim traps locks the player into a single strategy, so you have to lose a level before you know what tools you need to complete it. Wave 11 of the final level is ridiculous, just millions of bullet sinks that spawn bomb copters and has so many units that the game becomes unplayable, compounded with inability to change graphics quality. The final boss is just a melee unit with tons of hitpoints.
Uninspired, grindy, and annoying. 1/5 stars.