Yeeee! I love highscores in a game! I'd have loved to have a highscore ranking in our game, but time didn't allow for us to get to it. Unfortunately.
Needless to say I had to keep trying until I had the highscore :D
Very enjoyable. I started to feel a bit like an idiot for not being able to remember the location of the symbols in the underworld. Literally every time I picked up a new one I had to look where to put it instead of being able to memorize it.. But that's me being dumb, nothing on you.
The shaking when stuff was being hit in overworld was a bit much for me, could've been toned down a bit. Have you managed to reach the last wave? It gets really hard when you have zombies that are spawning out of sync of one another. (If you can manage to keep them in sync then you can go on for quite a bit - but with humans spawning as well, by the boatload at later stages, this becomes very tricky!
Nice one, thank you for your submission. I very much enjoyed it.