It probably depends what you mean by "light". Do you consider GDevelop not light enough because it's too complicated and difficult to use, or because it's an entire IDE, not just an engine/framework?
If it's the former, you're going to struggle, because that (and similar engines such as Ct.js, Construct 3, Clickteam Fusion 2.5 etc) are about as simple and user-friendly as you can possibly get (certainly without sacrificing a lot of versatility).
Otherwise, you are going to be restricted to extremely simple "engines" like Bitsy, Puzzlescript, Twine, etc - but I'd hesitate to even call those game creation tools, because (as you've probably discovered by now) they're so limiting in terms of the types of games that you can make with them, that it's almost more like re-skinning / modding an existing game than creating your own.
Pico-8 is obviously very popular, but again, it's both less user-friendly (requiring actual coding) and less versatile than engines like GDevelop / Construct - but the IDE is much lighter, if that's what you care about.