Fun, a bit on the difficult side, but I think that it works. from the 2nd platform you inform the player that the game will be brutal. The only two improvements I could recommend would be to add telegraphs for the player to learn from. For example an animation on the unformed platforms that flash if they have spikes. The treadmill sections on some of the platforms need some sort of indicator that they are there. That way they can learn to play with the mechanics.