I just played through the prototype. Not sure if infinite jumping is a feature or a bug. I managed to get to the gold gem, I'm guessing this is the end for now. Also noted that the green gem and the gold gem didn't trigger a pickup...
Is this just a test or are you planning to keep working on this. If you plan to keep working on it, would you care to explain what you're planning, I'd be interested to know.
Anyway, best of luck with development on this prototype, and congrats on uploading!