Thanks for playing!
I need to make it somehow transparent for the player that items have different weights. Maybe just simple text +3kg on pickup which slowly disappears, I will need to do a few iterations on that.
Yeah standing on the platform is not clear enough that something happened, I am thinking about moving to pick up to some different mechanics I have a few ideas now like moving it just to the interaction button or even some kind of mini-game (like picking them actually from the ground so you have run around to pick them up or catch them in the air)
I am thinking of finishing it to the full product, I will let you know!