Download Tower of Demon
Tower of Demon is a nice platformer game that was designed by a Japanese developer. Despite of the fact that the game does not feature an English translation, you would not need one, either, as the only elements present in the game regarding text are the menu entries.
The game has several levels and in each of them you will have to collect a number of coins, usually all of them, before you will be able to progress further. However, you will have to pay attention to the jumps that you have to make as some of them are pretty tricky.