FNA VS godex

MonoGame (MPL/С#) https://fna-xna.github.io/

I wonder if Godex[0] could be a fit for you. ECS based Godot, based on 3.x which has much more broad WebGL support.

[0] https://github.com/GodotECS/godex

There is usually a few steps how to deal with performance issues before reaching the conclusion "I need ECS", but if you need it then try https://github.com/GodotECS/godex

You might want to check out Godex. It is a Godot extension that introduces an entity/component system. It is not mature yet, but it is under development and seems promising. https://github.com/GodotECS/godex

However, the great thing about godot, is if you want a feature, like ECS, for example just add it yourself.

You can try the fork called Godex, it has ECS built into it and is a lot of fun to use in my opinion.

There is an ECS port for Godot named Godex, but it isn't hugely mature:

https://github.com/GodotECS/godex

I haven't used it, though I've been curious about it. As far as better options for ECS game engines go, I'd go with Bevy (personally), but you'll have to learn Rust (which I'm a proponent of anyway).

https://bevyengine.org/learn/book/introduction/

But both of these are still in "Beta", if that's even the proper term for their development cycle, at this point. They work, technically, but they could use some help, to my understanding.