I can spot a few bugs,
1) At first, even when i had ammo, it wouldnt let me switch weapons, so i was stuck with a cruddy pistol for my first 4 lives,
2) When i had 1 kill to go, (I swear this game hates me) I was using the gun at the bottom that kills them in 2 shots, and i had 3 bullets, but it wouldnt let me fire, so i died and then got to angry, so turned the game off and finally,
3)The enemies fire to fast, and take to many bullets and i do think that you should have a melee weapon that is pretty powerful, so instead of doing the clever thing, you can go on a suicide mission and slice your way to victory. But it still was an awesome game. Not as good as thing thing though. :-D