Thanks, I'm honestly suprised somebody played the game for more than a few seconds ^^
I don't know what an input buffer is, but I'll look into it. I've noticed the problem of the player sometimes not jumping (near the beginning there was one jump where that happened pretty often) but didn't know how to fix it. Thanks for suggesting that solution.
That the minecart sound always starts from new is annoying as hell and again, didn't know how to fix it. You're right, setting the volume to 0 instead of just stopping to play the sound should fix that.