This is old, but I'll reply anyways lol (cause I'm obsessed with otome games)
Since you listed mobile games I suggest (for Android) all of D3 Publisher's games, specifically their Forbidden Romance series such as The Men of Yoshiwara, The Rosy Script, Office Lovers, My Butler etc. D3 Publisher also released two games which they removed later on, but were actually pretty high quality: Gakuen Club which can be found on this forum and The Charming Empire which I have, so if you want it hmu.
Also recommend all of Ciagram's games such as Chocolate Temptation, Nightmare Harem, Bidding for Love etc. Their writing is more decent than great, but their stories can be pretty intriguing.
I also recommend StoryTaco.inc games, Day7 games, whomor Inc. games, Hunex CO., LTD games, and especially Idea Factory games (specifically Amnesia and Hakuoki)! It'd be a bit much to list some games for each developer so I'll just name drop them for now.
If you're into voice acting apps catered to the otome audience, I suggest Situation Boyfriend, Love & Poke, the Voice Supplement series, and the Sleepytime Boyfriend series which was removed from the playstore, but again if you want them hmu.
If you have IOS and have root access, I recommend NTT Solmare's old Shall We Date games aka Ninja Love, My Sweet Prince, Actor to Be, Konkatsu for Marriage, and Heian Love. A short time after, they had their second period of the Shall We Date series where they came out with two versions of the game apps, a paid version and a free version similar to Voltage Inc's old Gree system apps. This included Hero in Love, Mononoke Kiss, Never Look Back, Angel or Devil, Can't Say No, My Fairy Tales, Magic Sword, Scarlet Fate, Lost Island, and Guilty Alice. There were more, but I stopped keeping track because at some point they updated their system and I wasn't able to mod their newer games anymore. NTT Solmare removed all these games, but I still have them all because I hoard any otome game I come into contact with, so if you want them hmu.
As for PC, I recommend Hakuoki (I'm really biased with this one), Amnesia, Steam Prison, and Nightshade. I have a lot more recommendations as I mainly play otome games on PC, but I'll stop for now as I feel this is already too long. If you want PC recommendations just check my latest posts lol