The use colors are not bad I do see a few problems regarding the logo and your watermark to prevent users from stealing your work, keep in mind that you could duplicate your watermark and add a bit of transparency to it so users don’t have ways to remove it very easily.
The diamond doesn’t seem to match the concept your going for does it have to do anything about the game in general? I would keep creating different designs, and to try out many different ideas and styles you could experiment in creating other styles and see which one fits your game.
In the end, you could decrease the size of the diamond and make it fit in the center of the bottom ‘VR’, instead of putting it in a random area that doesn’t fit well. Otherwise, everything looks good not overdone its a simplistic attempt.