Nice modularisation of components! (e.g. PageLayout, GameCard within GameCardContainer.)
I like the grid of GitHub avatars! I'm very curious to know what the gameplay would be like. (Maybe summarise your goals in the README? :) From looking around I guess a pair-matching game? Excellent!
Grid scales well! (Some clever CSS?)
Fun (and unexpected) use of the GitHub API to build a game environment.
Good work on shuffling (randomising) the grid!
Code generally looks clean and neat. 🙂
Running locally works smoothly (git clone, npm install, npm run dev).