I used the Kruskal algorithm to generate the mazes. On the linked page the author complains that the algorithm “tends to create a lot of short dead-ends”, but that property makes it perfect for toddlers who don’t have the patience for extensive backtracking when they take the wrong path.
There’s no title screen bitmap and the player’s character is just a red box. I’d intended to come up with a pixel art title screen showing Amy Zing herself, and an Amy Zing sprite that would wander around the mazes, but that’s beyond the limit of my drawing ability (if anyone is interested in contributing a title screen and a sprite in 3 sizes, let me know).
Tinkering with menu systems, transitions, difficulty levels, presentation and general polish took long enough that the toddler in question has long since lost interest in solving mazes.