I really want to try this game but the language barrier is too much. There WAS a translation effort but i havent heard any news on its progress for like 2-3 years now so im pretty sure its abandoned now. But yeah, the battle system looked really technical and good. I saw some forum discussion about the game on gensokyo.org and such, but everyone who were discussing it didnt know japanese and i think their opinions werent really fair because of that. Technical+language barrier = bad.
But yeah, i think it halted due to lack of interest with those people, and the game's age, its older than most people are touhou fans so many simply never heard of it.
Edit, btw i you can read japanese, you should also play fushigi no gensokyo. Its got several expansions, an a sequel coming out too iirc. Translation patches were attempted but it wasnt feasible due to technical difficulties. Im hoping 2 will have translation interest without the same issues.