From the website linked in the post:

• Windows, Tabs, and Splits: Manage multiple terminal windows, each with several tabs and splits. Better yet, it is all rendered via native UI elements.
• GPU-Accelerated Rendering: Employs Metal on macOS and OpenGL on Linux for efficient, high-speed rendering.
• Hundreds of Themes: Swap between light and dark modes automatically, or choose from a vast library of visually appealing themes.
• Ligatures and Grapheme Clustering: Shows ligatures flawlessly, handles multi-codepoint emoji properly, and accurately renders Arabic and Hebrew (in left-to-right mode).
• Kitty Graphics Protocol Support: Let terminal applications display inline images for a richer visual experience.

It also says it's cross platform (macOS and Linux) and has configurable shortcuts with what they believe are sensible defaults.

Although at least Alacritty already has all of these features (very different “sensible” defaults, though) and is also available on Windows so I'm not sold.