Hello, your game is framerate dependent: the faster your framerate, the faster the animations. On a 144Hz monitor, it's impossible to make some of the jumps as Anie is falling like a rock a few pixels after jump. When I reduce my monitor refresh rate to 60Hz, it works like a charm. You need to time your animations according to the time elapsed between each animation frame and not by animation frame.
Regards, an avid reader and fellow game developer :)