Thank you for your feedback, happy to know that it helps you! I take note of your feedback, regarding the theme it is "nine patch rect" (search on the internet) textures designed to have fixed edges and a middle that stretches, most modern engines manage this I think, if this is not the case for you you can always open the image with aseprite and enlarge the sprite as you want, but I might add sprites like that in the next update!
ok thanks, i used python to create a 9 patch rect image from your nine patch rect file and it works well. i'll have to create each image i want for my ui individually but i think this is the best way. i am using phaser 3 so it doesn't have 9 patch rect built into it. this is the panel but it doesn't look like the pause menu you have. it looks like you used a different 9patchrect image for the paused screen. i guess im trying to figure out how you made the inside border of the panel and the background. im guessing its something to do with asperite? 
oh so thats how you got the inner border and made the background a different color. i think there is a background color missing. i might be able to make a python script so i can have 2 borders. i looked through all the 9pathrect files and all the files in the theme1 folder. i cant find any files with that background color so i thought you made it in asperite or something. i haven't learned godot yet though.
i just realized the corner is a different resolution. i guess there is something in godot that is built in that lets you generate corners like this? i am going to play around with it and see if i can make my own 9patchrect with the image.
there now it can be used as a 9patchrect! i made the dimensions 54 pixels for each corner
been slowly building my ui
1 day ago(+1)
Yes indeed I just checked and the background is generated via Godot, I will add this kind of simpler panel in the next versions of the pack!