Thanks! N-Step Steve is certainly a high compliment, it absolutely has those crazy moments of realization that I try to replicate.
Regarding puzzle 11: It seems I accidentally made LEFTOVERS too hard in v1.21 when I changed it to cross KEY (to remind players that words can cross). I forgot how hard it is to find words that cross over diagonally. I think I'll do a tiny update to revert that tonight.