even if you don't remember which one is the 3 and which is 4, you have 50/50 chance to get it right.Uh, there is no need to remember which one is which. It would be easy to figure it out by watching which one goes behind the other when they meet. I would say that level looks fairly easy to get the order on.
Anyway, I agree that there are too many things in it, there is no need to include a button, lever and

. I think they should only be included if they are actually needed to complete the level, or useful in some other way. Generally, levers don't make crystals appear, they change the layout of the level just like buttons. Crystals generally only appear by going to a specific part of the level, one that is somehow dangerous, not just a detour, which I think is good. You also seem to have included teleporters for no reason, which just looks weird.