I find the idea of starting in the beginning and working your way outwards pretty interesting, it just gives the level a certain feeling that I like : D
As others stated already, the mechanics are not really understandable in the beginning. It took me a little to understand you can wall jump. At first I thought the enemies were the things you are supposed to collect and I did not understand why I was suddenly dying.
Overall, enjoyablity wise, I think this still needs quite a bit to be truly enjoyable for me, but the overall idea is nice imo. : )