Thoughts on the current build.
This is my first play through partly because I usually wait till usually a later build because most early builds don't really have much in them.
Art: I really enjoy the art. 18, Vados and Helles look like fine wine.
Gameplay: So far so good. The training isn't too bad, but I do think that both Vados and 18 progressed a tad bit too quickly. Again as much as its fun to see the action happen, it feels best when its earned and I personally I don't think I earned it. Especially for 18, I get the need for it being quick...but at the same time I feel it would take a bit more for 18 to move on from Krillin. But that's just me nitpicking.
Story: to early in development to tell. But in terms of canon nitpicking, the SDBs are exclusive to U6 and U7, my recommendation is maybe have somewhere in the intro saying that the GP or Zeno made it so the SDBs scatter across all the universes.
I'd also recommend a gallery for unlocked scenes and way to check what your progress is for each girl but i'm sure you probably have those planned for a later date.
All and All I enjoyed it! It showed promise back when it was first announced and I've think you've done a bang up job with it so far. Keep up the good work!