Great game and it's cool to see that you designed the levels to explore the mechanics' potential! I assume the final level required you to first ping the bottom left of the map and then ping the staircase right when the bottom chest is retrieved so the player doesn't go back to the first ping?
One of the levels required only one ping but two were given, this was the one with a 3 locks and a spike around the staircase and two chests with keys near them. I was able to just ping the staircase and finish the level.
I think one thing that would help is to draw out the current pathfinding path and then update it when you see chests. Since the pathfinding isn't something easily predictable by the player this makes it easier to see in advance if your path will work and restart if it doesn't rather than having to wait for the entire path to complete.