Hello! Took a moment to feature your game in this big ol' Halloween video of mine. Your game begins at 1:06:47
Now this is a delightful idea for a game.
It feel voyeristic, and the few moments you look away from the windows to make room for an upcoming scare or something having changed make for a delightful little experience - even if the ending is somewhat predictable at about the halfway point.
There is one matter of suspension of disbelief, though - why does the window cleaner not LEAVE? They see more than enough evidence that this will be dangerous long, long before even getting close to the top, and at least having some inner monologue adressing it or finding some excuse to keep them there and keep them working would work wonders.
But still - it's a fun idea set up well. Loved it!