The concept is interesting, but I think there's something missing to it. Ignoring the obvious exploits - pressure plates being trivialized by just getting a bunch of Timmies on it, allowing you to completely disregard boxes, or keys going through spikes, making level 15 possible in just a single Timmy. I think it would be interesting to explore possibility of limited or minimal amount of Timmies to use. I would totally try to complete every level with the least amount of Timmies for the golden star 👀
Bonus points for narrative (poor Timmy and his diabetes) and ability to speed up the game (although I think it can cause some desyncs with how ghosts behave, and I find it weird that it's just slowly accelerating instead of being faster right away).