I saw screenshots of this on discord and was really excited to play it! And it did not disappoint. It's a very clever game. I respect your game's aesthetic it all feels really cohesive and smooth to play. I really love the pause time mechanic as well as the various magnet strength choices.
If you were to continue this, I have just one small suggestion: You could bind the magnets to toggle on and off with just left click and right click. Like how in portal, left click shoots one portal and right click the other. I often find myself struggling to activate a magnet when I need it too.
But anyway, great game! Wonderful execution. And I hope you make more :)