Hi Frank. I design levels for my own tile-based dungeon crawler, so Boulder Dash and Lolo logic (one wrong push and the puzzle is dead) is my kind of problem. The dragon egg timer is a good thing to design around, it turns every map into a route-planning question instead of a reflex test.
Offer: one regular campaign map free in your editor, so you see how I build and how I write up the intended solution. After that, $35 per regular map and $60 per boss arena, each delivered playtested with a written solution path and the failure cases I found. Windows here, so the editor is fine. Games at lowpolysaint.itch.io.
What grid size are the maps, and how many are you planning for the campaign?