Very cool concept! I think with some polish and expansion on the idea you could have a really cool and unique game!
The pixel art is very charming with a simple but clean and nice look. The lowered opacity to demonstrate the sort've "phantom movement" you do before the actual movement is a really nice design touch.
I'll brush past the obvious things already mentioned like no sound and some polish needed on the mechanics. The main thing that sticks out to me is the Godot default grey background and default font, I highly recommend for pixel art games going into the fonts settings and turning off anti-aliasing, it's a super easy and instant improvement visually. Here's an example of the difference.
Great work though! This is one of the most unique concepts I've seen in this jam, I hope you see this project further because it has a lot of potential!