Love the ending I have not seen a more incompetent "shock" ending in a long time. It's like a game from "the mind of M. Night Shyamalan". It's surprising but only because it makes little sense and goes against the previously established characterisation of the antagonists. Other than the horrendous ending (and rather poor writing all around) I liked it but I think you could have a quick tutorial in the beginning since it's kinda hard to remember all the little tricks and moves (like the fact that you can shoot open doors or triple jump) from a flash game I played quite a while ago. It shouldn't be anything involved of course (that would go against the feel of the game) but just have some paintings on the wall behind you early on and it could remove some initial misunderstandings.