Nikki's design is pretty awesome. I'd echo the comment that seeing your currently selected core via Nikki's visor would be awesome -- even though I like the pixel lava-lamp effect on the core in the upper right corner. I definitely need to give this game another go and really try to destroy all of the boxes. When I got to the end and had 12/50, I realized that I had forgotten about destroying everything and just focused on getting through the levels without dying a lot.