The pixel-art-based graphics on this game is excellent and sells the theme perfectly. It has all the retro-animations and graphics that you can expect from a 1990s game and it does a stellar job of execution by keeping it consistent throughout the game. Pixel-art graphics does not always mean a bad or lower level of detail, as Mindustry offers quite a high level of detail for its game world. Considering how many planets and areas can be unlocked for being a handheld game, it does not sacrifice the polygon count quality across the game.
https://www.ihqreviews.com/2021/07/28/mindustry-review-meeting-the-smartphone-gamers-expectations/