It's fun. Whoever made this is not a nice person. Lots of mental pain inflicted. Sweaty cold hands when I reached above the office part. It'd be nice if there was a timer from when you hold in jump, or a bar to gauge how long you've held for, otherwise you need to play for a while just to get a feeling for it.
-EDIT
around 10000 score in there are just invisible hitboxes above your head on the small cube jumps, also pretty aggrivating that your hitbox appears to be bigger than shown because you can bounce off things you visibly arent hitting.
AddictiveReplayabilityControls