I like playing Tetris. You could either play 1v1 or battle royale style. It’s pretty frustrating at first but when you get a little good it’s basically second nature
Best ones I know are Jstris or Tetr.io. Jstris is more minimal and good if you don’t like flashy graphics and Tetr.io is basically the opposite of that.
How much work is making a Minecraft server from scratch? What things need to be implemented? I saw on the GitHub that placing and destroying blocks was implemented, so I’m guessing it’s a lot of work