The Snow towers weren't meant to make the Blobs go in the opposite direction, that's a bug. There'll be a new update to fix that in a few days with other fixes and stuff.
I tried recreating what happened to you on the developer version and having too many Blobs on screen that have a negative speed value causes the game to crash, which caused the game over.
The MOB (supposed to be M.A.B) is glitched and doesn't spawn.
There'll be an update in a few days to fix stuff.