Took me a while to figure out how to operate the elevator, specifically how to go up. I was unsuccessfully clicking on floor levels and the game wasn't responding. It made me question whether the game was actually working.
I eventually figured it out, then later realized there are up and down arrows on the lever. But I feel like that should happen in the opposite order. Meaning the pixel arrows, especially in full screen, were not clear.
Clunky controls in general are not inherently bad. The controls in this game did grow on me, and I think they contribute to feeling like you're actually operating the hellevator, which is a good thing.