wow, this is a lot of fun and I really, really enjoyed this. Also, I have not seen anyone making use of the UI like this, so that is cool and creative
Only minor concerns I had is that the camera feels a bit too far zoomed out and the sprites to small (but, I guess you needed to find a good balance with the character size and the UI) and that sometimes, moving the UI around with your mouse, moving things in the UI and then moving your character with arrow keys feels a bit clunky.
But besides that, great game. amazing job!