Pretty bad, sometimes you can"t jump over a plateforme without shoot (1pixel too high), the line behind is very very fast and hollow too. Hollow have a LOT of HP then you can only speedrun, especialy if  you are followed by hollow...

Then kill something is a waste of time and scoring is a joke....

Also, the begining isn't a safe place and if you have a bad rng, you can"t regenerate a level (need a key for that!).

Good: nice graphismes and colors, music is repetitive but fine...