Hey thanks for the report. I did complete them but I did end up rebalancing them last minute to be 'easier' -- I wonder if my calculations were wrong. I'll double check, thanks!
EDIT: Hmm, something is very wrong in the live build vs my test build. The challenge itself is using the wrong level layout. I'll work on this, thanks for the heads up!
EDIT 2: Oops All Slimes is definitely do-able as is, but perhaps a bit too hard. But Oops all Demons might be impossible with my latest changes. Rebalancing now!