It's actually a very endearing game that works on the theme rather well.
The coin rush system is nice and same with bouncing on ghosts mostly. Speed is good too.
But I don't like the jump, it's rough and having to time your jumps in this weird way makes the platforming a bit clunky. Because it clashes head on with this speed run grab coin mentality. I suggest removing the 3 jump mechanic and just make one solid variable jump.
As for the levels, that one level is good, but this game really needs more levels because there's too much repetition.
Graphics wise, it's simple but neat. I think making them slightly more polished and adding more detail in some places could allow for something like Super Mario 64 quality. (Her animation is nice too)
Story concept seems weird. But it's just a simple
Overall, this game has alot of potential here to be fleshed out into a proper collection platformer. (ETC Super Mario 64) I'd like to see games like that again so if you expand upon this game it'd be pretty cool.