okay, last ver I played was 0.8.6.1
since then, what new content is there, particularly quest-wise and gameplay wise?
Not much in term of quests, the main quest itself (the Cecily one) still hasn't gotten any new continuation (I haven't checked all the possible new quest yet since I'm thinking of only doing those quests after the game hit full v1 with all quests implemented).
Gameplay wise there were a fair amount of changes since that version, for example with succubus build if you manage to stun a NPC through juicing, the stunning time is now a lot longer than it used to, just as long as the stunning time from when you hit a NPC from behind, pretty great buff for succubus build.
For physical build, the Flail and the Horse Cock used to be able to stun a NPC indefinitely as long as you keep hitting NPC from behind, that gave a pretty great utility for mob control. However, for this latest version in particular (0.9.4x) you can no longer infinitely stun NPC which is imo very sad and makes both Flail and the Horse Cock kinda mid for battle.
There was an overall significant improvement for magic build however like Tornado now pushing NPC towards the direction Lona is facing, Water Shot having 3 different variations, Fireball now has 2 variations, and some other changes.
There's some other changes but you can check out yourself there.