I liked your game . I liked carrying the cubes and droping them into the pit. It's simple but really satisfying. I think you could expand on that. There could be auto-thrower of the cubes ? Worker carrying themselves ?
The balance was good : when it was becoming tedious, the upgrades made it unnecessary. I'm not sure to fully comprehend how the automatisation happens : is it dropping a cube in base universe that make it go again in universe 1 ? The inverse ?
I was a bit slow I think (had the "scenic route" achievement :D ). Thanks for the game, was fun !
As for some ideas to help distribute the game : i think this prototype is solid, and would be much more played if it wasn't for the necessary download. And its a big file, i'm not sure you really need >1Go for this game. Maybe try some other engines, more browser friendly like unity / godot ? Or maybe try to package the game to ship the minimum of files.