I'm not sure what the problem is, but every time green platforms appear there is a microfreeze for a few milliseconds, which is bad enough to interfere with the game.
There is a small problem with the fact that the game starts right after the player respawns and sometimes it's hard enough to just react. Perhaps if you add a pause before spawning the player and give him the opportunity to choose the moment when he should start running, it will be more pleasant.
And so, there's not much to say. 3d platformer for time, made pleasantly enough. Patience in the future development of this or other games.