You've managed to get a nice little gem together here with not only the main character being well produced but the controls just seemed nice and fluid, running around the landscape was great and the use of colours is spot on.
I also like the use of the couple of images that are used to tell the downfall of man kind (I think). I do think that sound from the running does need to be a little softer and when the character jumps, I think the audio needs changing and should be less solid because the character is landing on sand.
Do you have plans to expand? Add a couple more buildings possibly and take the two gems from the tower and spread them around.
Well Done