Bob should move along with the platforms he's standing on.
Being pushed by the platforms is glitchy as fuck.
And maybe it's an idea to add other ways of death besides falling, sharpen the bottom of the swords or something.
The points shouldn't be calculated by the ammount of time you're not touching the start platform, it be better if you were given different points for different platforms you're standing on.
Half of the time you're just standing on the start platform jumping up and down, the playing field should be bigger and perhaps it's an idea to add scrolling so you can reach some more height.
Also, remap jumping to the up-key, it's a relaxed game so you should only have to use one hand.
It's a nice and simple game to play but it still needs lots of work.