Slime Rancher is a ranch simulation game developed by Monomi Park. You play as a rancher who goes out to collect slimes. Once collected, you need to feed and care for them. Once fed, the slimes give you money which is used to buy new parts to your ranch, expand your ranch, and upgrading existing corrals and gardens. The game was in early access for a long time but officially released worldwide this past August.
Slime Rancher uses a simple mobile-ish theme for most of it's UIs. However, it also uses a combination of diegetic UIs when it comes to your "Plort Transfer Machine" and your quests. As for the non-diegetic UI, much of it is kept very minimalist without taking too much of the screen. All of them are modals what scale to take up as much space as needed.
Slime Rancher uses a sans serif font that looks pretty generic, like Open Sans or Drive. There's a couple different weights and styles used for titles and body text. Much of the titles use a semi-bold while the body uses a regular weight. There are some points where Slime Rancher uses italics to give flavor (seen in the Slimepedia).
Slime Rancher uses a lot of blue for it's screens. Both light blue and a turquoise color. Highlights in the screens are usually a yellow color. However, some of the menus look a little unfinished by using black and white as their palette with grey for highlights.
The UX for Slime Rancher is fairly solid. There are some things that seem unfinished and might not work right (like the sliders in the Settings menu). The overall flow of the screens works well. I was able to play for a bit and come back a couple months later and pick it up with ease. The controls are responsive and easy to use, especially with a controller.