Heyy! Wow, thank you for the feedback and for playing i really appreciate that!
I might look into it when i have free time because my friends also reported frames instability ;/
As for the third level it should have been explained a little better for sure. A hint if you would like to quickly finish it:
"The buttons become inactive when nobody stands on them and the assigned block to each of them raise back. Maybe the janitor could help?"