This was really fun to play! Though I'm still very new to game design, I'll try my best to give some helpful feedback without looking at the other comments beforehand. (I'll also take caution to try avoid spoiling the experience for those who haven't played it yet and are reading the comments)
The good things first: The game felt super punchy, switching the magnet and having it snap to nearby objects felt really good, and almost every level had an 'ah-ha!' moment where all the puzzel pieces came together. Additionally, while I didn't play the original demo, I didn't encounter many of the other issues others complained of, the magnet remained central and I was consistently thinking of where it was and how it could help me influence the play area to my advantage.
Some criticisms: A bit nitpicky, but I noted that while it was helpful you had to hold the reset button to activate it (to avoid accidentally tripping it), it did take me a second to understand how it worked. I think it's because the reset icon didn't have a very noticable animation. If the icon 'filled up' as you held it down the way it works might feel a bit more obvious.
I also feel like the way the magnet travels through platforms is a little inconsistent. I only noticed this in the first level, where I cannot throw it through the platform, but I can in later levels. Possibly some distinction between platforms that let the magnet through, and those that can't, could be handy in cluing in the player.
Overall though, despite my minor complaints, I really think this game so far is really good! It feels unique and fun to play, and the puzzels are satisfying to complete. I'm excited to see what comes next! (No pressure of course!) Good luck!