my rating for this game is 8/10, it has an interesting and unique concept, and the core gameplay loop keeps you pretty engaged in the game despite its underlying idle nature.
however, it could use some more incentives for players to get creative while building their machines. like Hexx_Vixtar said; it gets kind of slow while you are waiting for knowledge points to unlock the alto layer. additionally, the lower levels start to become less important as you progress, which makes it feel not very worth it to invest in getting to the 3x/2x holes.
I think that if you buff knowledge gain based on how fast you can process balls and how often they go into the 2x/3x holes across all layers, it could help give players something to do while they wait, and it could also just straight up reduce the wait time if they build their layers well.
overall, the whole game is pretty fun, and I would play it again if it got some more updates and content in the future. I know that idle/incremental games are pretty hard to playtest yourself due to their slow pacing, so I think you did pretty well 馃憤