Honkai is a lot more yuri than other gacha games. It has actual kisses from official sources. I would only consider Sakura x Kallen and Seele x Bronya as canon pairings though. Kiana loves Mei, but it is unknown whether Mei loves Kiana romantically. However, given her recent development and back story, it's difficult to believe Mei doesn't love her back. For the other pairings, it's more subtext personally.