I enjoyed this game. Now, it did have its negative points, like with how it was mostly just the same enemies over and over. Still, it was pretty good. I guess it just works well as a time waster. The music is fine too. You can in fact get addicted to it. I thought maybe you could destroy the summoning things at the beginning.
You just have to hang on until they're all dead. It's weird how they have blood. How can robots have that? Maybe it's oil? While not great, I would recommend it.