Great little game! The mechanic of possessing things to interact and having limited "merges" makes for a great puzzle. Both the animations and the audio look good.
Personally, my biggest issue was with the controls. Being able to move, merge, and interact with the keyboard would have made the game feel much more fluid. This is especially true with the barrel! If you do want to keep the click-to-move mechanic then there should at least be path finding so it doesn't just go in a straight line.