This game is astoundingly clever. Unfortunately, perhaps too clever for me? Hard to tell if I was running into bugs or just Not Getting It, lol. The level names are clever and helpful clues for the most part, but I really struggled with the first level. EDIT: Turns out I couldn't figure it out because I didn't realize there was an option to jump, haha. Might want to add that to your control list in the game description for dummies like me. :,)
Being able to skip around the levels is really nice - some of them I understood and was able to complete, but some of them really just stumped me. Definitely the kind of thing I'd enjoy looking up the solutions for after getting stuck on it for a couple hours lol. When I did figure out the solutions it felt really satisfying, but made me even more confused about what the solutions were for the ones I couldn't figure out.
As others have said, the game gets very strange if you take the mini-cube off of the scale platform. It's also possible to completely despawn the big cube if you're moving the mini cube around too violently. I'm not sure if this is a glitch or part of the intended solution, but I was able to shove myself up onto the scale platform with the big cube? Additionally, the game gets a bit funky if you at any point press "Esc" (I defaulted to that before I realized it was "P" for Pause), had to completely reload the page. I also really wish it didn't capture my cursor (i.e. trap it within the game window and necessitate pausing to get it back). The combination of cursor-locked camera movement and first-person-perspective made me really motion sick, unfortunately.
In general I really enjoyed this game. Definitely one of my favourites so far. Good work!