Hey Dan, just finished playing your game, and I'll leave some feedback if you don't mind!
The game is very short, but that's OK: the mechanic of timebending is well explored, and the level design is good, requiring the player to get better and better at using Tempuss powers (nice pun by the way). Also by being short, the mechanic never starts to feel really repetitive. And most importantly I would say, this game is fun as well!
I would like to comment two things though, very minor stuff. The first is that you start with 99 lives, instead of nine: I think this is something you forget to change and was in there for debugging, maybe? And second, the mechanic of slowing down individual objects is great, but the one with slowing down (or making faster) the entire world (the cat included) I used only when it was introduced. Maybe it would be nice to see both interacting, or the global change of time speed changed to be more interesting.
Anyway, surely a good game!