I would really like to give this a full review because it seems like a good one but I'm having the same issue as others where enemies cease beyond the first four people. I tried playing in different browsers but it doesn't seem to be an issue with the difference in functioning on certain browsers. I hope that helps a little.
From what I can see of this game, the graphics are appealing, the gameplay is simple but may become more fun as levels increase, and the idea is nice. Based on that, I'll give you 3 and 1/2 stars.