I liked the lighting effects and the ghost guys showing how to play! Really neat!
Managed to defeat the first "super hugger zombie" and then the game spawned me near a ghost telling me to kill 'em all. Does it have any end? It seemed like after defeating that first tough guy the game just generated a stage randomly in which I had to kill everyone (which would be kinda amazing to have a random generator working like that in such a short time!). I was killing the zombies until I found a wall that had no wall, the super zombie fell in, and I fell right after him because I got curious if it was just a wall with no collider or he passed through fast enough as to not be detected!
Anyway, I liked the song, though it could be a bit more creepy or action paced. The melee weapons felt like they were so weak, maybe a heavier sound effect could help improve the feeling. The ranged weapons had a better sound but the enemies did not seem to feel anything, no knockback or reaction. Also, I didn't see much difference between the guns, using the large rifle killed the common zombies in the same amount of shots as the pistol.
The zombies were easy to cheese, it seems like when they are below you they try to jump (which is very nice and kinda scared me when I discovered it!) and when they are above they just test if they are near your position and started attacking the air. Perhaps adding some trigger to check if they are right at your side to attack could help?
A good action platformer overall!