Osaka's Big Adventure is a transformation platformer game created in the Flash engine by monomonkey.

This is a flash game about Transformation. The main character here is Osaka from Azumanga Daioh. She's in winter clothes because the sprite comes from a snowball game from Japan. Don't ask.

Anyway, the game is a fairly simple platformer with pitfalls. Instead of dying when you engage a pitfall, Osaka transforms into something related to the pitfall. It's fun!...kinda.