Not bad
I did nto understand what this had to do with disco, apart from the music and the guy's clothes. What was really cool about this game was that it was just shooting up zombies after zombies. I would have liked it if there was some more variety in it. I can certainly not complain about it being difficult. It would just work better if you gave out a bigger environment for the player to go around and wreak havoc. The coolest thing was some times where you could fire in both directions.
That was actually quite difficult and not even really worth it. The graphics in this were actually really cool. Everything had such a silly (dare I say, funky?) way of moving around. It's a goofy little game that you can enjoy for a quick play. It is extremely straightforward and you should also add more like weapons and enemies.