Your artstyle is similar to something but I don't remember know but you picked a really good one to learn. But anyway, I have few things which I think can be changed or tweaked.
The main thing I would change is Player object. Without any health game is just a brute force simulator. I just pushed forward and rushed straight to the Eggs. Also dash should be on cooldown and it's properties too. My idea is to increase time before changing dimensions to 1.5 minute, put 3 second cooldown on dash and slightly increase movement speed. The dimensions could be a little better too. You can add more enemy types, more puzzles and/or boss enemy. And UI text could be a little better. I don't know much about Godot but try to look "How to make text look good" or something like that. In Unity there is normal text class and TextMeshPro text class. Maybe there is something for Godot I wonder.
I think your idea has potential but needs more work. If you want more help don't hesitate to write to me or to anyone in the community or on forums! Don't be shy and talk about your problems. It's very important these days.