Here you will find all of my UI art, I made all of this with illustrator and implemented it into unity games.
The whole style of this game was cell shaded with relatively low poly models and minimal texturing. The style called for only what was essential to maintain a cartoony dystopian sci-fi atmosphere.
https://drive.google.com/file/d/1YRSFkd960pd6Y5kXzdjHfY3nayoSSqQn/view?usp=sharing

Charged cell background

Drained cell Background

Universal cell overlay

Full cell example
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Heart indicator

Health pip

Damage pip
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Shield pip

Aiming reticle

Shotgun attack indicator

Melee attack indicator

Low Energy indicator


Additional info
all the elements have an outline except for the textual indicators. this enabled the tutorial / interaction prompts to stand out above all the level geometry and UI elements.
The art style and UI of Jet Studio was heavily inspired by the graphics seen in Orion's Arm.