I love puzzle games, and see a lot of potential in this. However, it was way too short.
The "15" level had me baffled, until I read ArrogantDoucheNova's hint in the comments.
The card level was annoying until I realised I could change the suits... But in retrospect, I think that's more my bad for not realising it earlier. However, I had to guess the first combo; there was no logic shown to me that dictated "spades and spades equal hearts", only "clubs and clubs equal hearts". IMO, if you have to guess, it's not really a puzzle.
The Mona Lisa level would have been better if there was a second button under the paintings to change the face, instead of having to click the painting... Even after I figured that out, I feel that I solved it with a bit of educated guessing. I really didn't get the last one ("OGEN"). Like almost everyone else in the comments, I don't understand why you chopped the "D" off of "BLIND", either...
Not bad, but still a lot of room for improvement.