I love the concept of a lap-based platforming "racing" game!
The core idea here is very solid, and the movement feels very snappy and nice.
However I think some of the level design could be easier - especially since people have time limits. I couldn't finish a single lap on 3x mult level unless I used low gravity and double/triple jump.
I just ended up doing the shortest route on 1x mult with low gravity for the first 4 days, then attempted 3x mult some more, but can barely even get past the spikes on the first drop.
Other than that the core of the game is very solid!