I really enjoyed the art and the simplicity of the game/visuals. The puzzles were thought out- something that seems to be lacking in many puzzle game jam submissions. That includes the difficulty gradually increasing. I like the linked ring mechanic. Some of my ideas to improve are -maybe an undo move button -keybind restart so the 'both hands on keyboard' can stay consistent -increase player speed a tad? (that last one may just be my extremely low attention span kicking in :)
Overall, very impressed with the design of the game!