A fun little game that fits the theme quite well. Haven't played Ghosts and Gobins, but looking at youtube playthroughs I can see the resemblance.
The main level feels a bit unbalanced. Maybe make it so that the zombies spawn a bit faster? Now I could simply just skip all of them to get to the boss, which took a big difficulty leap. Took a while to beat the level and I was tempted to simply say that the boss was too difficult. Now I'm more inclined to say that the first part of the level was too easy xD
Would have been nice with another level!
The level editor was a really cool feature. The bats seem to fly out of bounds though, and there don't seem to be a way to quit to main menu from the editor.