The ten-level path
Level 1 is one arrow, one step. Then 2–3 arrows to a goal. A 4–5 square maze, then 8–10 squares with one obstacle. A repeat-x2 block, then repeat x3 or more on a longer maze. A simple if-wall-turn condition, then repeat plus condition. Two possible paths (pick the shorter). A complex maze with no hints.
Why arrows are real coding
Order, loops, and a tiny condition are the same habits later languages use. The game will share the short-level shell, graduate badge, and family credits when it launches.