[bitwize]

It's cool, but... the controls are needlessly wonky. Nintendo decided on a separate jump button, even eschewing joypad 'up' for jump, for a reason; it's much more precise to manipulate a character's lateral motion with one hand and control their jump with the other hand.

I'm working on a platform game myself, in Java for Android -- no libraries except the Android runtime. I always think it's cool when people write games this way. Things like Unity are great for cobbling together something quickly to iterate on an idea, but the last time I tried a Unity mobile game it made my phone hot.