Boxhead: More Rooms Good, but... meh.
Honestly, I like everything except for the new enemy.
There was something about there ONLY being zombies that made the game... pure.
I like how you can't walk through the barrels or the living zombies anymore, it makes the game a bit more frantic.
I like the new blood effects, too, and all the weapon upgrades.
It's really just the Devil thing that I don't like.
If you want to add a new enemy next time, consider making it a varient on the zombies, like, a stronger zombie that can take more hits and deals a bit more damage but still uses melee attacks.
Yeah.
Anyway, it's a nice game.
Congrats.