I might just be bad at platformers but man, I got infuriated with this game. But strangely enough, it...kinda worked out? Like, I'd be thinking of just quitting the game after not making a jump for the umpteenth time, and then accidentally find one of the secrets (which were awesome, btw) and decide to keep going. Reminds me of Cat Mario a bit.
From a mechanics perspective though, this was interesting. The design was really thoughtful in terms of cheese placement which added a neat planning element to the game. My main criticism is just to give the player time to use it by cutting out the leaps of faith where you essentially had to jump into a seemingly empty pit. I'd also replace the grey gradient-cloud-rectangle thing that acts as a death zone with spikes. Early on I kept either mistaking those things for platforms and then dying, which was a bit frustrating.