I also found the fact that you made it in Ren'Py really impressive.
I know it's possible to do a lot with the engine, but both the dungeon crawler aspect and the battles were really creative!
(Although sometimes the camera battles didn't register when I clicked on the faces, but I'm not sure if that was because my mouse just didn't recognize when I clicked or not)
Unfortunately, I was unable to find the secret ending. But I did get the extra scene from the locker! I'll have to keep trying to get the secret ending.
Keep up the good work! (I'll have to check out your visual novel sometime, too ^^)