Well I'm thoroughly impressed , I tried out the demo yesterday , and averaged around 15-20 fps on the shader heavy level , and around 20 - 30 in the level where all the enemies attack you. I have a pretty old and low end video card (GeforceFX5200) , So I'm actually very happy with its performance (keep in mind Sphere 2 runs at 2 fps on my pc). I'm definately going to look more into this engine when I have more time.

edit: It's actually 25-30 fps on the single player levels , most of the time staying locked at 30.