I guess there's not really anything I can comment here that other people didn't already comment, so I'll just be a broken record and repeat it as well, that the art and music here are really good. I even stayed on some rooms for long enought to be able to hear them entirely, and probably even a little more since I couldn't notice the loop on some of them (Wich is a nice thing I must say) x)
I didn't record a video since you did say this is was just a test course, so that means there's no real stuff to really comment on here. But hey, while that is true, it still is the best test course it could possibly be. It even managed to have a proper setpiece! I certainly can feel a lot of soul here already :3c
I guess the only minor nitpick I could be pesky to say is that the camera is a little finnicky as of right now, but I assume you already know that since you did say to refrain messing with it during combat.
Either way, good luck with that if you do continue with it, and I hope you have fun doing so!