I think for a sequel it would be cool to do a sort of open-worldish thing where you can't access certain areas earlier on in the game until you absorb a creature you find later, you could for instance have an acid-proof creature that you need to get before you can get to an area surrounded in pools of acid that you noticed before.
This game is actually terrible, and I see no major differences between it and shit like mafia wars. This game is just awful, and the developers are awful for birthing such a monstrosity. When I first played this game, I thought it was a joke, however it is still here refusing to die.