The game felt very responsive! All the little effects, particles, feedback (like the arrow when we are close enough to pick up the magnet) makes the game feel very intuitive.
My only critic on your design are the ramps: they looked too much like shadows and I often forgot they were there, assuming they were steps. Why not take away the steps where there are ramps, are have the ramps in a clearer colour?
Also why has - what I call the magnet destroyer - a red smiler face? At the beginning, I thought it only destroyed the positive/red magnet. I thought that was a bit confusing.
Apart from those tiny details, the levels were good! The environment is simple enough for the solution to be clear when I did find them. The last two levels were particularly great and got me scratching my head. Your mechanics are so cool I was starting to imagine levels for your game myself.
You can watch my walkthrough here for my full reactions:
While I am at it, thank you for your work on your YouTube channel: it got me to appreciate games on such a higher level!