The dark color fits the game nicely, but I do think that if you play around with the gradient’s a bit and maybe the fonts the ui will look much better.
Nice and simple!
If you want some feedback id say use a different font or even more then one font. Also for the “Play” and “Update Log” I’d make the both have the text aligned to the Left vs center. But other then that nicely done!
Sleek and not overdone. I like the approach you intended to achieve. I would however consider using other features align with the current UI buttons to feel in part of the left side not sure if you’ve already got this planned out. I find you could include other basic options seen in variety of games online to has a more better appearance.
Why not try using different different fonts or including the game name in the left side range. While it does look good, if you lack ideas on what other elements to place down gather inspiration whether it’s getting basic ideas from games that feature a basic style try thinking of some that’ll look good to you.
Other then that as your going for a basic style it looks fine already,