Not being able to move horizontally and vertically at the same was a bit confusing and also annoying.
The violent camera pan when moving sideways was also extremely unpleasant.
It would have also been less annoying if the music continued playing when restarting a level, instead of starting over each time.
Gameplay was ok, though sometimes the slime and laser hitboxes seemed larger than they should be.
The bat as cute and graphics in general were nice though maybe the background could have used a little detail.