GENERAL COMMENTS:
1)
The character seems needlessly slow. It's most noticeable in the tutorial, which is essentially just "hold right" for the first half, but that's not the only time it's annoying. Some of the levels require you to travel their breadth twice to complete them, and a little bit of speed would help alleviate frustration if there are multiple resets (or just make the levels smaller).
2)
When I was messing around with the settings I noticed that "E" could not be mapped to any of the keyboard controls. This is the only button on my entire keyboard (other than "ESC") to receive this treatment. Due to the specificity, I assume that this is intentional, but I can't figure out why: The button which used to be mapped to "E," Carry/Enter Aim Mode, can be remapped; there literally isn't the option of leaving the Carry option blank or unmapped; and I can think of no negative repercussions to allowing that key to be mapped as the player wishes (especially since it's permanently mapped to LMB).
3)
If you bind Carry/Enter Aim Mode to LMB, then the game reads it as two inputs every time you click. This makes it impossible to carry the magnet with you. Either you immediately throw the magnet, or you hold the button which causes you to stop and begin aiming.
4)
A down control for passing through one-way platforms you're standing on would be nice.
LEVEL SPECIFIC COMMENTS:
Level 3:
The three-by-three block to the left of the one-way platforms seems unnecessary, and it makes it annoying to get back down, if you start up the one-way platforms and then change your mind.
Level 6:
The gap under the blue magnet panel could be one or two blocks thinner. It's annoying to solve the puzzle, but then have to start over because you missed the jump.