My only suggestion is maybe adding a header in a different color? Maybe white?
This is a VERY poor example but I hope it gets my point across on what I mean:
Not bad at all. Though as you are asking for feedback I will do my best at it.
1. Try using different color in texts such as white or yellow or whatever suits you.
2. I would recommend you separate your main Ui and the heading.
3. Make your Icons such as the rebirth and the cursor image white, it’d look better to be honest.
Otherwise not bad at all. You could also add your own detailing to the ui’s and there are always Tutorials on DevForum and YouTube that can help you increase the quality and detailing of Uis.
Generally, your design is alright, however, I will give you some tips to improve
You need to be consistent with your UI’s. Some of most of the buttons have a 3D effect, but your Rebirth menu does not.
I would make the rebirth buttons larger or construct it differently, as it can strain your eyes looking at a small button
It would really help if you used an external software for your GUI (Adobe XD, Photoshop etc.)as you have more tools at your disposal!