Amazing project! Hard enough to just complete something and feel good about it. Left lots of thoughts in the survey, but the biggest note is that while the puzzles were good, I found several situations I knew what I had to do, but it felt like it was taking too long to set it all up.
Would love to see some bigger spaces to traverse. There's potential for where the magnet can take you... I guess the closest and easiest comparison would be sonic style-level design. Where you're leading us through space. I know you're focused on a puzzler, and I think this would still nicely complement your puzzles.
Picturing a small puzzle room, you solve the puzzle, then you have some easy traversal rewards that let you see a bigger open space (hopefully giving some storytelling in the process). Then during that point veterans and curious players may catch "challenge" opportunities to sneak away from the main road and solve more problems using the mechanics.
I'll upload an atrocious screenshot-edit, but just some possible directions to consider. Loved playing this and hope there were some helpful thoughts here. (would be so excited if we got to build levels using your project on GitHub or something)