My key to victory: Spam Penguin the Wizards and once in a while some Pink Dragons. Before unlocking those, I do a pattern of Elite Rhinos, Monkey the Pirates, and Rooky the Kangaroo. Before unlocking Elite Rhino, replace it with Defensive Tortoise.
I love how if you upgrade the bazooka to leave a flame behind and you kill a flying enemy with the bazooka, it leaves a little flame floating in the sky :P
Sorry to say, but I hate it. Whenever i try to move, I won't stop moving that way, and I have to bash the buttons to stop moving, by then I already got in a hard room, and I just hate this game. Fun withOUT the stuck buttons.