This app was mentioned in 4 comments, with an average of 1.50 upvotes
I've been playing Super Phantom Cat, it's a old-school style platformer in which you can actually get new forms for your player character. It's simple to learn, but the levels can be tough to master, and since it's free, I highly recommend it!
https://play.google.com/store/apps/details?id=com.veewo.supercat&hl=en