The main draw of this game is meant to be creating your own creatures, but I'm not good at that at all, they keep walking in the wrong direction lmao. But it's fine cause not only do you create your own, enemies have a chance of dropping a card that makes them usable as well, and they have quite nice designs. The enemies you capture can be customized too so even if I'm not good at making my own I can mess them up at least. Reimu and Space Invaders are some of the hidden monsters btw.
I really love the environments in this game too, lots of toy looking places, one of my favorite genres of levels. The sand castle that's a proper castle is especially good.
Odd note: The in-game timer doesn't tick when you're editing monsters