Nice graphics, atmosphere, gameplay and a nice joke.
But, Revolver, Shootgun and Maschinegun (your first weapons are way better than the "special"weapons are nearly useless for faster enemys, also switching weapons is very unsmooth, but very importent to do fast at my opinion. Also the game could be a better explained: how works this gun, whats the reason why you have been to "slow" etc.
But beside that a well done game!