1.) You can't press right twice to stop, then up repeatedly to climb.
2.) You can't press various arrow keys after jumping to do a trick pose that gives you extra points.
3.) There's only 1 degree of 'turning right', not two. Same w/ left.
6) You cannot jump by clicking the mouse.
We used it to increase the high score on our primary school computers from a measly 11 to several tens of thousands in a couple of minutes.
Otherwise, pretty darn faithful recreation, great job!
Thanks again! Naturally, I encourage you to contribute with code if you are that way inclined :)