Is there some meaning of the level that's blinking?
stuck on Hilbert's hotel.
Is this the real end? I don't know how to make progress here.
You are in the room turned by 90 degrees - that part cannot be left. But also, seems you already figured this out by now, as you’re one room after.
This place is more about the fact that the zigzag lines indicate regions with gravity flipping vs regions with jumping. As such, the “This one is your end” is a section you definitely can’t beat with gravity flipping - but you don’t have to, as you can just jump over the block.