I love Bun's music!!! And I'm just so overjoyed with how Ogata's route came out, especially considering he was one of my least favorite characters in the manga! Writing his route gave me much more of an appreciation for him and what fans see in him (as well as the amazing NSFW art omggg)! I felt really self-conscious that I wouldn't be able to write something that fans of his would enjoy, so all the support from the team really helped make it what it is!!!
As for the Vasily route, you really do have to do some pretty specific stuff for him to get all the way through his route, so I would follow along with the hint sheet carefully. Most importantly, you absolutely have to practice Russian at least once before you go meet him at the dentist's office; otherwise, you can never progress all the way through his route. If you are still having trouble, please comment again and I can provide more detailed instructions!