Hi , thanks for that funny game! If you want to upgrade something, I recommend you to make bigger the hammer's hitbox.. And put also a visual and auditive feedback when you're hitting a mouse.
If I may, I wanted to ask you a question about the way you uploaded your game on itch.io..
Even when trying a blank project on UE4, the "game.data" file will always exceed itch.io's limit, how you managed to upload your game on HTML5?