OK, I think I have finished the entire game... It is no way to pass through portal without ruining the path. Should be Two Way Floor around the plate. 
Viewing post in Cosmoroboros jam comments
Amazing job on getting so far! I’m really glad to see someone take on the full challenge! :D
The second screenshot shows the intended way of solving level 36 (now 35) but there was a bug which made looping on one-way tiles impossible. I just uploaded a fix, and the level can now be solved. I’m sorry for the oversight and hope to see you continue your quest! :p
Update: after consolidating our level-designer I figured out that the level is beatable after all! You have to use the box as bridge. :D I think I will keep the small change with how the breakable floor works for now since it is probably more intuitive.
Here’s the solution: https://youtu.be/MMusnAIxVhI