This is a Mario-style platformer in which you play as a cat who curses enemies by hitting them with vampire bats. Only after cursing an enemy will you be able to jump onto and kill them. Click on "How to play" for controls and other game information.
Ctrl - Jump
Shift - Release bat
Arrow keys - Move left and right
Note: In case you don't figure it out yourself, the question mark jars are like the question mark boxes from the Mario games: hit them from below to get their contents.