You know what, lemme share my chains of thought with you.
I started with "oh shit, that feels clunky", came to "ahh, that's how it works!" to "darn, I think im too simple for this" until I really got to enjoy your game.
I really liked what you can do with the magnets, and that contributed to the flair. One of my first discoveries in Portal has been the infinite loop, and I really felt reminded of this when I discovered a similair way to gain a lot of momentum.
Regarding the level, I felt your passion to create something meatboy-ish, and I'll give it to you, it was fine. It's always hard to resemble SMB in a game not being a Jump-N-Run exactly like SMB!
I really really liked you integrating so much space for training. With the utmost pride I declare myself the ruler over the red-only-chamber needing only a staggering minute to complete the task, while rushing trough the blue-only in about ten seconds. By being limited to only one magnet, I actually started to appreciate both of them and learn how they worked respectively, better than in the tutorial. Ah, the tutorial.
My dude, why do you create a game labelling every level a "tutorial"? That's actually the only real complaint I have other than the lack of music (my ears always need 120 dB of horrible techno, otherwise a game simply does not get it, if you follow my irony), being that besides Chamber 1, the game is pretty darn small.
I would've loved to see around twenty levels or so. Don't get me wrong, creating levels being juust right is probably pretty difficult, especially when considering that your magnets are a little bit imprecise when compared to Portals portals. But at the end of the day, I think there is a lot of room for addition and improvement, but what you already delivered really tastes like something.
So, overall: Good work! Visuals being appropiate for the style, in my mind (I never give much about grafics. Gameplay matters!), a clever gameplay-concept, room for physics-defiying attrocities and a wonderfully cute transition between the screens.
The only lack is the lack of levels. Other than that, I feel really ~attracted~ to your game.