Thank you so much for playing and commenting on my game!
I was indeed considering to include some sort of tutorial, but it got cut off due to time (and maaaybe a little bit of interest). I was also considering ramping up the different enemy times, but ultimately I just wanted to start this first game with a '5 minutes of fun' kinda idea.
The 'sticking' on the wall part was actually a bug, but I liked the way it acted so I left it in. It also seems okay for a bat/vampire to be able to stick to walls.
Really appreciate the feedback!