Glitch/bug: In stage 12, found myself fighting a resurrecting skeleton without a life bar. It never attacked, but it also never died. Gave up after getting a chain up to ~270 attacks on it. It clearly wasn't going anywhere.
Other bugs notices: Status effect markers almost never disappear from above monsters when the relevant effects expire. When reapplying these effects, extra markers appear over them. Also, I have no idea why my character glows green throughout the entire game. This started around the time when I picked up the regen spell. I'm not sure if that is the regen effect. Regen spell doesn't appear to scale in a useful way - 100 something hit points periodically when you have over ten thousand is a waste of magic points. :)
Discovered a bug where, in some instances, inflicting the slow status on monsters stopped them from moving at all, ever again. On a personal note, I think an ability to negate the effects of the enemies' charging abilities should exist. In some instances, I found myself desperately defending against what was a normal foe, but was getting three to four turns to my one, even while slowed. This issue was more prevalent after the first playthrough.
 "Mighty Knight"){kind=icon}
 "Enola: Prelude"){kind=icon}
 "Arkandian Explorer"){kind=icon}
 "Falling Sands"){kind=icon}