"Dreamverse" would be the real competitor for Rosebud since it's already way more versatile compared to Minecraft, Roblox etc. https://www.youtube.com/watch?v=QE996r92obE

Here's some dream games made by kids: https://www.youtube.com/watch?v=rezzjJ4NtK0

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I've also built a simpler version of this near Christmas holidays. It's very fun to code this kind of stuff.

Here's the demo: https://resurrect.ing/

Difference being mine is to build small tools instead of games.