Played the game twice (but had to mostly skip story). I used Luna Translator and it's "enough" for non Chinese speakers but it's not an optimal experience if I'm honest.
The game is fun, there's a bit of balance issues on some items but it's a single dev (on design) as far as I'm aware so I'll cut him some slack.
Other than that, it's mostly positives, a good talent tree, generally good map design and enemy placement, around a 5/10 or 6/10 difficulty mark in calamity mode, which is "hard enough" to avoid excessive frustration.
Generally a pretty good entry in the magic tower subgenre and definitely worth a try if you know Chinese or are willing to put up with a translator.
P.D: On the Touhou side of things this leans more into the fanfiction side of things than fanworks, just in case that matters to you.