The skeleton ground bro says at the beginning of Tiny Crypt that if you reach wave 20 you unlock a new level. I have gotten every achievment except Survivor and the secret one. I've played Tiny Crypt multiple times and get swarmed way too quick it seems and when I die it's said I'm past wave 20 but I have never unlocked any other survival maps except Tiny Crypt. Is this a bug?...

I love this game but I'm on my first run on Weenie difficulty and after I get to the end and me and all the boys kill the king the game freezes and doesn't respond before I can leave through the portal. I am using 2 graveyard smash + passives so I have a lot of units at once. Maybe I'm putting too much pressure on it? Idk...

...How do you unlock this? I know it's something to do with the critter corpse but idk how/where, been trying for ages!

I did look up what they are, and I'm a bit stumped how you're supposed to activate it. Is it survival related stuff? I've tried messing around campaign. Keeping my soul and all that through satanic campaign and such. Not much. Any hints?

Seems like the upper levels of this don't do anything. Every level just kills one person.