Already played it lots of time, the only problems that i found are:
1 - the texts doesn't move with camera shake.
2 - the "portals" and the final door aren't set on "isTrigger", i think that it would be better like that.
Thanks a lot for your feedback! I'm really glad that someone plays it such a long time after creation :) Right now I'm working on other projects, but if I ever get back to this one, I will come back to your advices for sure!