An Interesting game, the music matches the overall theme. Considering you made this game in 48hours, I am looking forward to what you will do if you had more time. One thing I would say is that try keeping your controls closer because sometimes it's harder to find the keys. A suggestion is: A and D to move, W to jump, and Q and R to shrink and grow.
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As long as the controls are logical(make sense and are reasonably spaced), I think people can, because since your game is a sidescroller many people are expecting the use of w, a, s, d keys, and/or the number keys, maybe even a mouse input. It will make the controls easier and much more planned. Hope this helps.