Simple but addictive

This game looks easy but it's really challenging. As time goes by, the number of enemies increases, which makes it harder. I even got stuck on one level. I think it's addictive too because when I started playing it, I felt that I didn't want to stop anymore. The enemies I encountered had a lot of variety. That's why it never gets boring. It's really great, what makes it greater is it can be played offline!