Classy
I like it mainly because of the variety in the shop. The fact that this is a demo says a lot about the full game. Game play is fun because you can concentrate on shooting the enemies in a barrage of fire without have to worry about reloading. The controls are nice because they are universal and simplistic.
However, I didn't like the missing spaces in the floors. They do make it so the levels are different from each other which is good, but they increase difficulty a little bit. Overall, great game play, graphics and variety of weapons, especially for a demo.