You play as a pogostick trapped within your haunted hotel. Survive the time and get to as many levels as you can, learning the mechanics of the monsters as you...
Every random couple of seconds past level I believe 5~, theres a invisible block that chooses a side of the map top to bottom, left to right.
The slime creature itself has a bullet behavior and if the box is touching the left side of the map, it'd mirror and reverse its speed.