I finished the bonus disk of Touhou Labyrinth and got access to New Game +.
It was nice but there is a lot of grinding to to at the final floor to beat the last few bosses.
How much? Well, chances are you'll level up all the character you're using to at least level 500.
Outside of that, the final boss (20th floor), getting to the 21th floor and maybe the few bosses you'll get stuck,
you won't need to do much extra grinding assuming you fight the random battles as you explore.
I can't help but feel the last bosses at the 30th floor were artificially given high level.
Then again... when you get there, every random battles is a boss fight and only a few are realistically doable when you first arrive.
Then you manage to beat a few more of them. As you do so, you start to fight the bosses that must be defeated to open the way to the 30th floors bosses.
Since you can't beat them yet, you take note of what is going wrong in the battles against those bosses.
You run out of gas midway through the battle? You spend bonus points on SP to prevent that.
Your tank died? You spend bonus points on its HP and defense.
Master Spark does a ton of damage? You boost Marisa Intelligence.
Grinding in this game is strategic and in the whole process of finishing the last floor, you can see your team getting better.
By the time you're getting ready to take on the final final bonus boss,
those encounter that were at first bosses end up being small fry that get defeated relatively quickly as you do at least 1 million damage per hit.
Was that what the maker(s?) of the game going for? If that's the case, it's a success.
In any case, if you don't mind lot of grinding at the end, the Bonus Disk of Touhou Labyrinth is good.
If you do mind the grinding, just go to the 30 floor and then consider calling it a day (as the pacing is fine up to that point). : P