One thing to keep in mind at the moment is the graphics optimization. I'm not really sure what's going on but the frames are dropping like crazy, it's actually worse than Genshin when I'm using a high end phone. I saw just a while ago that the game is on maintenance, and I do hope they're fixing it up. I do believe it's regarding how slow the loading assets were when you did a batch download right from the get go. I mean seriously, 4GB? That's quite a lot, and it's definitely understandable. I just hope it will be fixed after maintenance.
I highly suggest you guys give it a try, especially if you are into strategic turn based games like this. This one became my favourite just from the get go. I hope you'll feel the same once you tried it. Cheers!