Thanks for playing! The level with timing platforms has 2 valid solutions:
one like you sait with timing the platforms, the trick is to stop them when they dont move and start when the other one stops again.
second solution is to destroy the spike block in the middle and stop there when platforms go down.
about the last level with horizontal moving platform, I was nearly asleep when i made it and I forgot that it is standard to make it carry the player.