Really nice game. The graphics are fantastic, the controls are very responsive. You have a small bug when pressing left and right key together ;) Maybe catch that in a separate "if" and let the player do nothing, but i have no idea how to do that in game maker studio.
I made it to the graveyard party or whatever it was called at the end of level 3. Died twice there, so I have no idea how much else is left after that. Sorry for not making it further.
To the level design. The march of the zombies is a little boring to play because it is a fixed sequence. Some randomization would be cool here. Also the holes in the rain of blood (i don't know if that is the correct name) were really badly placed like going from far right to far left which always lost me one life...
It was also sad, that I had to play in such a small window, but despite all the negativity, i gave you good rates ;)
Maybe you want to check our interpretation of cursemas eve ;)