But it's not addictive
The key to having an addictive game is the pace, and this one crawls along extremely slowly. Give the player more speed.
In a related note, if I'm holding up and right, I should be moving in both directions with the same speed as I would if it were the only direction I were going. Especially considering the spiders do that already. With the controls the way they are now, I'm not convinced that it's possible to get past the point where there's a wide ledge and 3 spiders without killing them, which would make one of your medals impossible to get if I'm correct. That makes the game frustrating rather than addictive, and people are going to walk away from it.
That said, the art is very good as well as the music, and it IS a good idea. You just need to work on the pace and player movement.