Nicely done, with a very retro feel. At first I was annoyed by the slow movement, but after a while I got quite into it; you are a space explorer, after all, and gravity is weird. I got above 200 coins, and the secret rooms were interesting to find. There seems to be some weirdness with jumping onto platforms above and to the side of oneself; my feet don't reach the platform (although my body does) and I sorta "glitch" onto that platform anyway. This could probably be solved with a tiny little animation, much like the (excellent) one where our little explorer does a three-point "superhero" landing when falling from a height.
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Thanks Stuart - appreciate the comment and the feedback. You're right about the glitch - it is a side effect of the collision engine I'm using. I thought it made the platforming more forgiving, and even used it in some areas to have platforms that you shouldn't be able to reach.
I like the idea of adding a little animation to it to show him climbing onto the platform. I shall see if I can work that out.