Pretty fun game, didn't encounter any technical issues. I really liked the music and the arcade feel to it. The graphics were also good. I didn't get to try 2 player mode but I think that would be a lot of fun.
I did feel like the gameplay could be improved. Being able to pick up more weapons would be nice. I thought that the gamepad controls were hard to get used to with the second analog for aiming, I expected shooting to work in 8 directions. I switched to the keyboard and mouse since it was much easier to play that way. I also noticed enemies could get stuck in each other so you could walk around and gather them all in one spot then kill them.