It's been a while since Japanese support was released, but I finally finished the game.
I played on the hardest difficulty and with a wizard build, but towards the end I wanted to take on stronger enemies.
Overall, the game was great and I enjoyed it until the end. (Although I wish the cursor key shortcuts could be customized more freely.)
I would love to see a New Game+ feature implemented, but with The Outer Worlds 2 coming up, there's no need to rush.
Thanks to the team for providing such a great Japanese translation.