It got nice concept and idea, the BGM is not bad too, the theme is also a rare thing these day, which is good, it just need a little bit more oomph to it, but it got promising beginning.

Is there a way to shoot in other directions? One of the replicating enemies spawned at the bottom of the screen and just stayed there.  Also, I think the flicker on the tail is a bit irritating. It's a decent game otherwise though.