Hello everyone!
I’m finally making my first simulator I haven’t even earnt a single robux from my passion projects and I’m doing some UI for my microtransactions menu. I have never done that kind of UI, so I’m not confident if players will find it attractive enough for them to click on it. Here it is:
Looks great! Make sure to not make the gamepass icons so streched. Make sure to add more color to your UI! Keep up the great work! 
Maybe make the shades more different. Like make the background lighter?
Also the ScrollFrames background colour is different to everywhere else so maybe make that the same?
Besides that I think it looks really good!
Maybe for your primary color do an even lighter blue to make the contrast a little bit deeper.
It’s pretty good! However, there are a few improvements you could do:
The buttons don’t stand out as much. They seem to blend a little too well with the background. It might make an user with sight issues think that they have to click right on the label instead of a bigger button. If you make it a contrasting color, it’ll stand out a lot more.
Same thing goes with the scrolling bar. Too similar to the background.
You should improve the contrast in colors more. Other than that, good jobn
