Know Bugs List (more like to lazy to fix list)
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I have not played with this thing in a while so here is what I remember.

1) The game periodically will miss a slice of the walls, this should
    be easily corrected.

2) The game has some counter or something in it that eventually causes
    division by zero, that should be fairly easy to track down. (maybe
    related to the frame/second counter).

3) The players movement is not fully functional. Impacting walls will
    demonstrate this.

4) The engine allows the player to get too close to the walls. This
   should be changed.