I loved this! The divining rod works great, combat was simple but really fun, and honestly the only thing I can say is that I'm sad that I'll have to wait longer to play the full game if you do decide to finish it. I stopped at your dev note telling me to stop if I don't want spoilers, but I don't know if I can really keep my hands to myself for long. haha.
There were a few bugs, for example I managed to get the lock on sound to be stuck a few times by triggering a dialog/menu/etc. while it was playing, and Valencia doesn't despawn from near the mines when *the* cutscene plays (you know the one, major spoilers), but honestly for your first audio game you're doing really well in my opinion. I want more!
The locking on works great, holding R and turning works really well, maybe having a quick 360 scan where it plays sounds from the direction where something is + announcing it for a quick sweep without changing your direction? Maybe a bit more ambience sources to make the world feel more alive? But I'm kinda grasping at straws here. This is cool.
Oh actually, one thing. The quick combat instructions only say the buttons for gamepad, not for keyboard. I poked around until I accidentally discovered that it's z.