Amazing so far! I can tell the full release will be spectacular.
One thing: While playing this on Beetle Saturn, I encountered a freeze after beating the haunted mansion boss. A text window opened, but right when the actual text was supposed to show up, all animation and responsiveness stopped. Lemina's audio, which started playing before the freeze, continued to completion.
To get around this, I had to convert my save file to something compatible with Yabause (the first other emulator I tried), then beat the boss again. Afterwards, I re-saved, re-converted, and continued again with Beetle.
Update: Same thing happened again after taking the magic arrow to the tower. After entering, the cinematic played, the bad guy began speaking, but no text. Frozen.