Collision is finicky, sometimes players will hit the sides face first but it will still count as them landing on the platform. In general the game is easy to cheese when that bug doesn't occur though, as all you have to do is move the platform to the top and you can ignore half the game.
The roblox death sounds seem very out of place, as does the music playing the Mario coin sound effect.
If the game was reworked a little, I could definitely see this as a fun mobile game.