Before you play, try to collect 5 scarbs (The things on the level select that says you need to do ___ to get a scarb) so that at the end you don't have to, because some are hard to get because you finish so fast.
You should have the up key to be disabled when touching an object higher on the screen for you, and the same with all the other direction..It'll help with your vibration problem. :P
Hey sr2449 can you let me know what the side scrolling issue you're seeing is? And perhaps what browser?