Game version: Downloaded from itch.io
Problem: In the 3rd room with the jar. Pomu won't go to the proper location to get the puzzle piece it just quickly shows the arrows as if you clicked there.
Solution: Walked Pomu right up to the trashcan where it shows that pathing should go and then clicked on the piece and the problem was solved.
Another problem seems like Pomu doesn't want to walk in front of the desk in that same room. Got close by clicking the jar and then violently clicking the blueprints
Beat it. Worth.