Its a good game although I am gonna say. As mentioned in another comment, the game starts off with a very intriguing dialogue about blood cells and whatever, then it goes silent. The music is great, great atmosphere and visuals. But, the controls are kinda cranky, specially when it comes to jumping. And I noticed that after splitting, they both face a different direction, so that when jumping off of herself you will intuitively jump in the wrong direction since you already started walking in the other direction. Its not much but its enough to break the immersion in the experience and I personally found it very infuriating. Besides that, the game itself is good. I think the splitting mechanic is fun to play around with, although it can be a little mind boggling in the beginning. To end my rant (sorry for that) I think the game needs some more polishing.
edit: Its hard to tell because people are different, but I prefer the intuitive approach. Anyway good job, its nice that there was a learning moment. Most times in production you wish you could go back and fix a fundamental issue but its too late, just gotta take notice and do better on the next game!