LGPL would be fine for a game engine.
Anime slut to catch your attention
As far as I'm aware lookups to _G are more costly than local variables.
Use GPL2 if you want to make people's lives hell with no recourse over the slightest technicality.
How it works is this: someone fucks up once with your code, their license to use or distribute it at all is voided immediately. Standard copyright infringement assrape applies unless the vict- infringer negotiates a new contract with you. That gives you complete power over them - you can be like SFLC and drag them into FOSS compliance like they should have been in the first place, or you can be like Patrick McHardy and suck their bank balance dry, or you can just be a cunt and put them out of business.
GPL3 changes that by giving people 30 days to fix their own shit after they've been told to do so before you can sue them, which is why so many power-tripping narcissists hate it.
permissive licenses really do make you retarded.
Wasn't Ren'Py originally a fork of Pygame?
Would explain all the bloat
Show me a game engine that isn't bloated.
...
no. it's a thin wrapper on SDL2 or whatever display it uses
Look at the website mate, it does a lot more than you might think