Glad you noticed the similarity!
The BGM we use are all taken from various free to use sources as linked in our credits screen such as Dova Music and some here on itch. We tried to encapsulate the particular feeling of listening to MH music by carefully choosing some themes that work with characters, locations, and situations. BUT, none of the BGM are actually taken from the MH games themselves. Just a similar feeling, giving the game a bit more of an identity but also a feeling of familiarity.
We do plan on adding more music in the future update but that will be a while since it will need a lot of careful consideration :>
Also I really wanted to get more music from Frontier but its so specific.... it's actually a challenge.
- Roda -