This bug makes the game very difficult to play. When I press a key, the player moves fine, but when I stop pressing it, for some reason, the player continues to move in that direction. This doesn't happen every time, but It is a common occurrence. It seems that the game doesn't register the key being released a lot of the time. This is not a keyboard or computer problem, since I never had this happen in any other application. In the video below, I am waking around, and I start jumping after pressing the space bar, leading me to believe that the game didn't register the key being released.

This bug is difficult to reproduce, as not many people have experience this, and only one other bug report exists on this topic (that I know of).