Ok so it's a pretty good game overall. I loved the sound effects The atmosphere was pretty good too, however I would have made the music a little more... suspenseful and silent, if you know what i'm saying. The gameplay was pretty fun too, however, in my opinion, it was too difficult for enjoyment... I guess that's not really something I can say... but I personally would enjoy it more if the gameplay had more to do with uncovering the more of the story vs. jumping and avoiding spikes. The art was pretty effective as well, however, like the gameplay it can be improved by making all the pixels the same size (like for exaple, some of the paintings in the background had big pixels vs. the spikes in the foreground). Also the spikes could be more symmetrical and the lines a little less jagged.
So overall, even though there are aspects of this game that can be improved on, it is certainly not amateur and feels pretty solid.
(Oh and you can jump behind one of the paintings... I am not sure if that's intentional XD )