Dolls / Girls Frontline 2: Exilium[0][1][2] is a modern take on the XCOM concept.

Free (but gacha.)

0. https://gf2exilium.sunborngame.com/main

1. https://gf2.haoplay.com/jp/

2. https://store.steampowered.com/app/3308670/GIRLS_FRONTLINE_2...