I'm a bit worried. Can you watch that video I sent you and compare it with how the game is running on your end? I'll be devastated if it turns out that I made an inconsistent update loop for a game jam again. It doesn't even matter if people think it doesn't harm the game, just having the possibility of incorrect update loops at all is a nightmare for me.
Though uh... I will be honest, the gravity and jumping is reasonably floaty on my computer too, either way. So it could be running as intended. I think it's something I worked on for a while, trying different gravity and jump force variables on repeat but then for some reason settling on imperfect values.
If only my friends IRL had the time to actually playtest this for me last week. One of them was doing an installation of something in freaking Scotland.