Here you have the coplete changelog for the v0.73 version:

• New Nation: Syqua Including plot, events, new characters, a new minigame, among other stuff.
• New main girl : Koa (Shark girl)
• Alternative looks (bikini) in Syqua for: Nulkan (not a bikini xD), Dynae, Izuin, Nadine, Luth, Saraith, Vex, Yraselle, Night Queen, Jilliana, Atzi, Hazel, Teigan, Zira, Ragna.
• Special event with animated H-scene for: Dynae, Izuin, Nadine, Luth, Saraith, Vex, Yraselle, Night Queen, Jilliana, Atzi, Hazel, Teigan, Zira, Ragna.
• Vex, Atzi and Yraselle can reach level 10. That includes 3 intimate animations for each one.
• Koa 1st Date (Including H-scene)
• Ragna 2nd Date (Including H-scene)
• Jilliana 3rd Date (Including alternative look and H-scene)
• Jilliana quickie event.
• Yraselle (Blonde & Purple) has been slighlty redesigned. This also includes updating some of her date H-scenes with the new changes.
• First High Succubus: Aries. Including a new sex battle.
• Maple and Khara are available for sex training.
• Very likely, Yraselle, Nadine and Jilliana will receive a topless idle animation for after their quickie events.