Since this game running on unity engine and we're all know that we cant change any graphics settings at all, what u need to do is a little bit of change in the registry to make it works.

First u need to navigate to the registry editor with Windows button + R then type "regedit"

While inside your registry editor u need to navigate to Samurai maiden folder, the location is:
Computer\HKEY_CURRENT_USER\SOFTWARE\D3 PUBLISHER\SAMURAI MAIDEN

In here u need to make a new value to change the graphics, this basically creating a graphics preset settings for u
Just right click then choose New > DWORD (32-bit) Value

Now name your new value with UnityGraphicsQuality_h1669003810




And thats it u basically done
for the graphics settings u just need to double click the value and change the number in it



0 = lowest settings (this also turn off v-sync for me)
1 = low settings
2 = medium settings
3 = high settings
4 = highest settings ( u start playing with this settings by default why bother anyway )

Since this is just preset settings this is all we can do for now, if u want advanced settings guess we need to wait for the future update.
Enjoy :D