I confess I have no idea what a trapdoor maze is, but I’m delighted if my little puzzle reveals the secret to anything. Glad you liked it!
'Trapdoor maze' is a reference to Deadly Rooms of Death (DRoD), where an entire archetype of puzzles is 'a bunch of tiles you can only step on once; step on all of them'. In this context, the darker blots are like multi-step trapdoors, and the logic for 'how to traverse them' is still deeply related.