The game looks very nice. When jumping, I sometimes had the feeling jumping higher and lower. The idea of moving objects is good, but it's difficult. It would be great if you could move when you pick them up.
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Thanks for playing!
The difference in jump height is because your upward velocity is set to zero when you let go of the space bar or W. For the full jump, just hold the jump button until you reach the apex height.
The objects move to a predetermined position relative to the player when you click on them, but you're free to move and combine them after that. This is something I wanted to change, but ran out of time for.