This app was mentioned in 11 comments, with an average of 1.45 upvotes
I love the Bloons series. They're all pretty good. At the moment, I am really into Bloons Monkey City, since it is a bit more complex and includes city-building aspects and PvP without being p2w. I imagine it will plateau at some point and I'll have to move on, but it's been fun for a while now.
Maybe not so pure empire, and with TD twist (or maybe more like a TD with building twist) but I'm greatly enjoying Bloons Monkey City and after 20 lvls (2 month now, maybe even more, not sure) there is no big p2w here, only some speed ups with building, but if someone pay more, it ll go to higher lvls quickly, then he have to play with others on higher lvl, so no big deal. Also p2w currency is easily accessible by in-game actions, by pvp, completing pve levels perfectly and sometimes just by pve levels. Also pvp is optional here.
iOS doesn't have hundreds of devices we have to make the game work with. Even then, SAS4 was out on Android before iOS. It's not a simple task, making a game.
Anyway, game is out on Android now :) https://play.google.com/store/apps/details?id=com.ninjakiwi.monkeycity
It's available now :)
https://play.google.com/store/apps/details?id=com.ninjakiwi.monkeycity
Before the one ask what game is that - btd6, Bloon Tower Defence 6, steam link here, mobile and steam game.
This one is paid game, but few other games in series are free to play, of free ones in the series, imho the best is BMC, steam link and android link.
All games of series are passive strategy games of Tower Defence genree (oh, the name of the game, it have td in the name after all); where the player have to buy(hire?) and build stationary towers that attack waves of hordes of enemies trying to sneak between 2 points, start and the end of path, we cannot allow them to, in this game, our enemies are bloons, fancy and cute bloons.
The tower (Boomerang 520 Monkey) on screen throws bouncy shuriken like glaives while have unlimited (or 3?) spinning infinitely around tower for massive damage.
tbh, unsure how accurate this is to Terrarias Zenith, still gonna craft my first Zenith, playing fresh master world.
I like this one: https://play.google.com/store/apps/details?id=com.ninjakiwi.monkeycity
I'm pretty sure it's not exactly what you are looking for but it's worth a look because you might like it.