PSP homebrew developer MK2k - author of Sleep'n'Wake - has released a port of the classic platform game, Jump 'n Bump. If you're not familiar with the game, it's basically bunnies that jump on each others heads for points.
The bunnies go by the name of Dott, Jiffy, Fizz and Mijji. You control one of the fluffy bunnies and try to jump on the heads of other bunnies, making them explode and scoring you a point. Here is the description from the developer:
This is a game for the whole family. You are cute fluffy little bunnies and hop on the other bunnies' heads.
At the beginning you are in the menu, where you have to jump over the tree trunk if you want to play and walk right. Then you'll enter the arena. The aim is to jump on the other bunnies' heads...
Users should go through the readme file included in the download for the controls and installation instructions.