lol it wants input from your keyboard because it needs the input so you can control the things in game.
Certain versions of Unity do this on certain versions of Mac. At the game engine's forums:
https://forum.unity.com/threads/input-monitoring-problem-in-catalina.757361/
Some other instances in the wild:
https://answers.unity.com/questions/1671267/mac-game-rejected-for-accessibility-...
https://itch.io/t/835617/edit-seems-like-a-macos-catalinaunity-issue-permission-...
https://www.reddit.com/r/GodsUnchained/comments/dfuxvr/why_would_gu_need_such_pe...
It's neither this game nor its devs, nor is the game spying on you. You should learn to ask questions instead of making accusations when you're confused.