It's my remake I made a few months ago! It's my first UI that's actually stuck around for this long. Ridiculous how lazy I've gotten, but it just works so well for me.
I am not Caithlyn, I don't know if he still plays either, but his later versions were nothing like his earlier ones.
If you made the number colored by how much health one has, it could work quite well. I'd try the monospaced font for sure.