Caster is a multiplatform (iPhone, Windows, Mac, Linux) toy, most of which is created by one person . Remotely resembles MDK. You control a nimble boy with different abilities, which cleans the world from evil spirits and gradually “pumped”.
The game is paid ($ 5), but a free demo version is available for download (about 50 MiB in size, only seven missions). For those who buy the game, all subsequent episodes for it will be free. Screenshots from the Linux version of the game: