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Edit: 

The path shown is not neccesarily the path the magnet takes:

Here (Lvl 7) it looks as if one could throw the magnet through the hole between the block and the ground. But the magnet gets blocked by the big block:

I thought the same about your first two points. Maybe one could raise the  driving speed in the hub level since it is far more spacious. For me it was neither too fast nor too slow while inside the levels.

I really liked this demo.   Overall it feels very good and is very fun playing. Although it weren't implemented I was able to feel the heavy "thumb" sound of the magnets falling to the ground. Very good job with this especially considdering this game does not even have sound yet.  Regarding the difficulty  : for me at least most levels were quite easy.   I were able to solve them  after a few trials.   Only the last level was very difficult. It took me some time until I finally figured it out.

Now to what I noticed while playing it:

SUGGESTIONS:

- Why do I have to press a button to pick up the magnet, but auto-pickup the key?

- Why do I let go of the magnet upon entering a magnetized revolving door, but I keep the hold on the magnet whilst getting pulled towards another large magnet.

- Maybe start AND    end aiming with right mouse button and throw with the left mouse button. This is more intuitiv since that's what is being used in most games: RMB: zoom/aim LMB: shoot/trigger (Also while the game tells you that you can throw with E, but it doesn't tell you that you can shoot with the mouse. I only found out through the options menu)

- Maybe add the possibility to go downwards through semi-solid objects usind the "down" key. Similar to how Super Mario can jump up through floors and falls back down by ducking.

For example the ladder in Lvl 3. One can climb it by jumping upwards but one can not go down by pressing "down". By this you don't need to leave space to get down. 

- Keyboard options: When using a non-english keyboard the depicted button might differ from the actual button pressed: I have a QWERTZ keyboard so compared to the standard english keyboard "Y" and "Z" are swapped. So if I want to rebind an action e.g. "Jump" to my Z key it shows that I have bound the action to my Y key. The problem is worse for more different keyboards like a cyrillic or greek Keyboard.

-   It is not possible to   spam the  "magnet action" key.    One can only use the key again until after the animation has played. Because of this one can not use the blue magnetic beams to quickly  turn the magnet red  and back to blue mid air so that it gets  some additional  height.

- On keyboard controll it feels a bit weird having the left hand pointer finger do the job for three actions: Move right, swap polarization and throw magnet. Furthermore one can not simultaneously move right whilst pressing "swap polarization" or "throw magnet".

(Also like others have already said, it would be nice to be able to move while aiming, maybe  it would be nice to move only slowly while aming such that minor corrections are easily possible.)

MINOR DETAILS:

level design:

- The ladder in Lvl 3 could use an additional stair, so that it is shut with the floor to the sides of it. As it currently is one needs to do an awkward jump. 

- The chain in Lvl feels a bit janky. Whilst the magnet and the box go up and down, the length of the chain varies. Thus it feels more like a rubber band than a solid iron chain.

MINOR BUGS:

- (Windows) Holding down LMB to aim. Alt-Tab out of the game and back into it. The robot thorws the magnet and you can drive around. But you cannot pick the magnet up (using "E"). You have to click into the game window to be able to pick it up again.

- Credit Level: when driving to the far right side the level shifts up and down a few pixel.