For the thing about not knowing what the main objective is, I kinda forgot to add a simple UI panel at the start that would've explained some parts of the game, so I think that should help out with directions.
Not sure why that bug would happen, might have to look into it.
Managing the difficulty is definitely a difficult task for me because when testing I rarely take into account that I know the game so I can play it easily, I should work on testing a bit more. I do quite like the suggestion of reverse timing, that could be something with a reward base(Stars) thing when finishing. Time limit was what came to mind in terms of difficulty and I just didn't think of anything else.
Thank You! I'm glad you liked it visually. This was my first time making my own models in blender so that's where the bulk of my effort went.
I wanted to do more with boxes and loading them, I'll have see what more I could do with that though.