I tested all levels and got succeeded in all but the last one, it felt much more difficult than the ones before but im also pretty dumb so that might be on me, i dont like the HUD, it takes away the flow of the game and feels like it stops you too often, maybe multiple puzzles in a row behind every door could help, the idea of throwing away the magnet for every door is interesting but i dont think its very intuitive that throwing a magnet in a pipe would open a door, the background and design quickly gets repetetive which is only worsened by the HUD, reloading the levels feels a bit clunky and slow, maybe assign each object a default state that it returns when you hit reset and just respawn the character (if thats possible in Unity), when you aim you can trigger buttons with the magnet because of how the character moves the magnet up and down while aiming, maybe deactivate the magnets hitbox while aiming, on the last level i got the magnet stuck between the big - crate and the + magnet while it was active and then when i turned the magnet to -, it started weirdly virbrating, not a big issue right now but that could maybe lead to bugs in other puzzles
overall very positiive experience, i hope i could help