I loved playing this game. The thrill of pushing a heavy object while getting attacked is both hilarious and engaging. I really enjoy how much is going on in the sandbox-like world, with many differently behaving enemy types and items scattered about. With a little bit of expansion, the game's solid framework could support more emergent gameplay scenarios.
The cute animations you added to the sprites add a ton of personality, and the sounds and knockback when an enemy is hit are very satisfying.
It's somewhat challenging, but not very punishing because of how much health you have. I'd recommend new players check out the tips before starting, but I had a blast just playing around and figuring everything out for myself.
Great job!