I never played v1.2 before playing this V2.0, and I have been watching the whole video series up to this point. I am playing on the windows version. Here are my thoughts; I hope they are helpful.
1. I was confused on the first level on how to get back, and if I had actually solved the puzzle or not.
1.1. I kept trying to use the tube in the level to open up the door to go back just like I did to get to the level. Eventually I just pulled up the pause menu and saw the option to go back to the hub. If they was a in-level way to do that I never found it.
1.2. After the key moved up after capturing it, I wasn't sure that I was done. I kept trying to figure out a way to get to it. Throw the magnet at it, jump at it, jump from a ledge, etc. Eventually I figured out that the key going up meant I had captured it but that was only after going back to the hub and seeing the sign changed.
2. The physicality of the magnet and the fact that it moves around felt a little janky. I was on a narrow ledge and started aiming the magnet, but then the magnet pushed me off the edge (i.e. the magnet extended out toward the wall pushing me off).
3. The the "thanks for playing" level some the block looking elements flash as the character moves.
4. I was a little let down by the "thanks for playing" level as I was expecting a final puzzle that would be a test of everything that I had learned thus far.
5. In the final puzzle, I got stuck (could walk out) from behind the switch in the top right corner. The switch was facing me, so I could in theory walk over it, but I had the jump to get out of that space. This felt like unintentional and not great.
6. This was a fun little 15 minutes! I really enjoyed it. It's really amazing the amount of work that goes into making even a little gem like this game.