Combo Attacks, Defensive type (shields\healing\buffing) monsters, Higher training lvls, PvP ladder, Equips for monsters, Breeding monsters would be cool. just some ideas I'm sure your aware of. Good Job! ( I tip'd you ) so far I couldnt stop playing but felt it all ended too soon. I look forward to seeing more updates. Thanks for your hard work!
Great TD game, a bit easy. The amount of waves, I think should be at least twice as many per level. I would just start get into the level and bam its over.