Is this one even worth playing yet or should I wait 3+ years for full release?
There is quite a lot of content in this game already, main problems you will likely face especially as a newer player are the large grind and confusing progression to unlock the scenes. There are built in cheats and a guide to character events in the phone however, to progress you need to jump around to different characters' sections a lot and the guide is not well written.
This thread has a lot of information so using the search function with it will help massively. While this game does have good animations and (subjectively)good art, there is no major "WOW! I need to play that." hooks that can't be found in other games.
Due to the dev seemingly adding more characters every few updates the completion of the game is looking like after 2030 if it ever happens at all.
Give it at least two hours if you want to try it out, also if you are playing on android there will be some UI problems, just search for keywords in this thread to figure out how to fix them.