>I've heard TikTok described similarly compared with YouTube. Makes me wonder if there's room for a "TikTok for games"

IMO it's the remixing that makes TikTok work. The equivalent would be every game is open sourced and remixable in easy ways. Like the way you can take one TikTok's video audio and recontextualize the meaning with your own video. Or an audio track can become the format that everyone follows by using the audio.

https://castle.xyz/ is sorta that concept, but could also be described as "hypercard meets instagram"

I absolutely think there's room for it, but I have doubts about how feasible it is. With tools like bitsy its possible to create an interesting game really fast, but nowhere near as fast as a tiktok video, and the "time to variety of things you can do" ratio for video is far better than it is for software.

Maybe it is possible though, would love to see the day if so

You mean HypeHype? https://hypehype.com/

(I'm not affiliated)

Dreams on the PS4 is a little like this. Every game loads instantly, and every asset is remixable into other games and offshoots.

It was called newgrounds.