The dev for this game, potemki11, just woke up one day and decided to make one of the best Shin Megami Tensei clones and make it even better by adding Touhou characters to it.

Difficulty is perfectly balanced, there is nothing in here that's as frustrating as most other SMT games or even Touhou RPGs, except maybe the Secret Boss? Which is debatable as it's really easy to cheese if you've been paying attention to your stats altering moves.

The developer isn't even done with this game btw, he's still adding new content to it to this day, including a customizeable level/map editor, so I will probably go back to this in the near future.