Well there's Agashi's other otome "This, My Soul", which I really loved, though it is SciFi and I guess that's not everyone's cup of tea. I liked The Rose of Segunda, though it feels a bit on the short side. Valentines Otome is the longest free otome I've played through, and it's hilarious and sweet and just plain enjoyable. It's the sequel to Halloween Otome, which is fine but you can tell they improved a lot for the 2nd one. The Blind Griffin is short and a bit more story-focused than romantic, but I really enjoyed it. I enjoyed Pinewood Island a lot, but not everyone wants murder mysteries in their otomes, so there's that.
All of these are either free or have a free demo here on itch.io.