I like the idea, and the art is nice as well. However, it wasn't all that clear to me what I needed to do. I guess I had to go to the terminals in the other colours, but does it matter in which order and how can I reach them? The facility seemed pretty big and I was quickly starting to loose my bearing. I don't know if the gravity was only up and down or also left and right, but that would be pretty cool if it isn't in the game already. Some sound would be great as well, even if it's just sounds of the astronaut in his suit.
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I definitely leave you to discover where to go next, and the game doesn't really communicate a bigger goal. There is an order of locks and keys and I hope they're laid out in such a way that you find them at the right time. For me that really recalls the feeling of Metroid, where you're just dropped into a place and have to figure it out as you go, but it does make things rather obtuse. Would a map have helped, perhaps? Or some hint at the final goal?
And to your other points: I would have loved to put in sound but I didn't get around to it. It would have made things so much richer. And I thought about doing more with gravity but I found it gets really complex designing good levels that work with all directions and still restrict you in some way.