a simplistic, and small game, but excellent in pure entertainment.
also i liked the intro ''fighting those ''FUGGIN LOCKZZZZ'' oh yeah! got me in the mood, combined with the doom theme/fights, still you could add more music tracks into it...
anyway, if you make a next one, make the character move in directions, or make a setting in an abandoned spaceship lab, where you fight undead members of the glock-group, and the locks group!
could sound fun, mait.s
errr good game, just do more, and keep at the doom theme.