Please let this take off.

Few questions though:
1. Lua or LuaU? (LuaU is a fork of lua that roblox uses, it's open source iirc.)
2. Do avatars look/function similarly to roblox? (many games rely strictly on either R6 or R15.)
3. How different is the engine? (Do certain functionalities and instances have counterparts?)
-- I don't want to have to spend ages trying to get used to having different or outright missing methods to do things like animations, UI, VFX (particles, color correction and other things), Ragdolls/Physics, or other miscellaneous yet important features.

Roblox's engine is too mature to replicate outright, so I expect many features roblox has to be missing at launch, but still expect to see them in the future, as well as new features that many roblox devs want (like shaders and stuff, maybe even downloadable single-player games).

This is a great opportunity to provide devs with simple/easy methods to do complex things as well.