You are Berti, the garbage collector, who has been called into a warehouse to clean up after a runaway monkey. The monkey discovered banana trees here and has hidden on the 51st floor. However, on his escape, he ate a lot of bananas and carelessly threw the peels onto the floor. You must now make your way up through each floor, picking up after him and avoiding the garbage monsters.
To get through each level, you'll also have to strategically move blocks to gain access to the banana peels and to block the monsters. Two types of monsters will be after you, but watch out for the purple ones as they can also move blocks.
The game is like a cross between Sokoban and Rodent's Revenge. It's simple, fun, and at times very challenging. It will keep you entertained for hours, and you can always go back and retry a level because it records the number of steps you take. The less steps you take, the higher on the charts you'll be.
The game is in German, but the menus are: