Pix the Cat is a mashup of Snake and Pac Man made by Pastagames. It follows Pix, the cat, as you save ducklings from an infinite maze in rapid, arcade-like succession. The game is an extremely visceral experience with lots of screen flashes and over the top feedback. It's one of those games you can play alone for 5 minutes or 5 hours, alone or with your friends! Definitely recommend it for anyone who likes over the top feedback.
Pix the Cat doesn't have a clear theme with it's UI. The game tries to being an arcade aesthetic to your computer and does so perfectly with the in-game UI. However, the menus are all over the place. From the strange "looking at a TV" menu to the neon colors of the tutorial, there's not really a singular theme or layout. I believe the game gives each unique play mode a different theme according to what it is. For instance, the Versus Mode has a heavy and metallic theme while the Arcade Mode has a neon and colorful theme.
There are a couple different type choices in Pix the Cat. Most of them are blocky sans-serif fonts that are embossed to give it a 3D look. All text in Pix the Cat is capitalized. You'll be hard pressed to find a lower-case letter in the game that's not a company logo or the controls screen. I want to also point out the type choice in Arcade mode. Note the letter "E" is turned into 3 horizontal lines and the text is faded to make the score stand out more. This is a good example of a stylized text being used and our brain fills in the rest of the word. If you stare a the word "speed' for too long it starts to look funny.
Pix the Cat uses contrasting yellow/orange and blue/purple. Blue and purple are used for backgrounds and large buttons while the yellow and orange are used to stand out and bring attention to certain elements such as your current selection and titles. Other colors might be used for different play modes such as versus using more muted colors to give it that metallic look.