What is it ?

Zoesteria is a biome mod which adds a bunch of new biomes and related blocks to the world.

What does it offer ?

New biomes to explore which are added to the default worldgen, with a bunch of flowers to go with them. It doesn't seem to contain any notable issue in performances, and some of the biomes actually look pretty nice (I quite like the sort of woodland-ish biomes even if many would find them generic).

Where it falls short is in its global looks : a lot of biomes feel a bit generic and unoriginal, even if to me unoriginality isn't something which is enough to disqualify a mod as one always takes inspirations from the outside world and other people's work even subconsciously (just like matter you can only transform not create, choosing where transformation becomes creation is arbitrary), but a lot of the mod's ideas have been done and redone in much better ways .
A lot of these biomes could have passed as purposely trying to emulate a certain vanilla-friendliness if they didn't rely on a bunch of new trees with bland textures , and for a mod which adds custom contents outside of just biomes there's a surprising lack of ground decorations outside of a few new flowers here and there among the overly-bright bushes; That means in terms of gameplay that actually traversing the biomes doesn't really feel that interesting nor challenging if that's what your looking for.

In conclusion

I heard of this mod a looong time ago, I'm almost surprised it was left to rot away after all those years (technically, there's Zoesteria 2 but its just a similar situation in 1.15 instead). It only having about one version (excluding the alphas) with what to me seems like placeholder textures makes me feel it never was intended to be something more though, if you want similar features done in a much better way there's Terrestria , which even seems to be somewhat tied to Zoesteria but I could be mistaken.
It could still work in a modpack due to it having a whole separate config folder outside of the config files which allows to tweak and disable biomes among other stuff, even if it doesn't go too far in possibilities.