Hi Mark!
Great improvement over the previous versions. I had a lot of fun figuring out the later puzzles.
I have come across some visual bugs while playing full screen on a non standard aspect ratio [16:10].
1) The black plane in the loading screen doesn't cover my entire monitor.
2) The magnet color and restart menu icons as well as the key counter are not fully visible and are clipped at the top of my monitor.
3) The system hint to change the magnet polarity never disappeared in my playthrough.
4) [Not a visual bug but a comfort feature] I would like the magnet to already be picked up when entering the hub area. This might just be me but I have found this extra step to pull me out of the flow of the game a little.
Overall a solid improvement. I am excited to see where this game will go in future updates!