I unlocked kagura after beating the arena. But what do u have to do to unlock rika?

I cant beat the arena with WSAD because i play arrow keys for 15 years Any way to change it in a ini file or so?

I missed one star and searched the map multiple times. Is there a star hidden or difficult to find? Maybe anyone can help me to find the last one.

please,how to unlock KAGURA?

I picked this up as a joke, and honestly? I don't regret it. The semi-regular updates keep me coming back and it's fun to just run around and shoot things (with water, of course). The one thing I would like though, is an option to allow us to keep our weapon out at all times. It's a minor thing, but I want it. >.<...