Hm.
Well, the background and Neru could be more detailed, for a repetitive game like this, the graphic needs to be eye-catching. The neru-clones are somewhat fast for me, I only got 27 points so far, but even so, because there is no final boss (or a picture reward after defeating X enemy.. :p ) it gets boring.
Don't get me wrong, it's probably better than anything i'll ever make, but it could be better. ^^