About the project:
Metroid Remix was first concieved in 2008 by Kuro-chan, under the idea of taking a shot at enhancing a current video game. While there were other candidates under consideration, Metroid 1 won given Kuro-chan's interest in that series.
The first attempt to develop Metroid Remix was in 2009, but did not gain much traction due to issues with engine development. It was abandoned in late 2009, though many of the graphics and work were saved in the event they could be put to use later. That came true on the first day of 2011 when Emperor and Kuro agreed to resume and restart development, and have been working on Remix since. Since then, the team has recruited many game testers, concept advisors and even a website instruction manual developer.
So it's basically a retake on the first metroid while ignoring all the other games (especially zero mission), but still having items like spider-ball, grapple beam and plasma beam.
Oh, and good luck trying to control it. You can't change the control, despite what the download page says, even Joy2key can't do the job.
If you have a way to play it without the awful default control scheme, just let me know, because it looks awesome.