Just beat it the other night. I still have about 100 bots to get and finish the secret levels and other stuff. Amazing game. Only complaint I could honestly say was I wish there were more levels using some power ups that barely got used such as the sponge powerup or the one with the monkey paws/sticky gloves.
I would like for a sequel to have more movesets that you can do from the movement alone like maybe more wall jumping areas and other obstacles that rely on platforming/movement alone. As it is though, the game is a perfect base for even greater things that they can take from here.