Very fun entry!
I really like the idea of the "reveal spell" being used to trigger turn-based battles in rooms with ghosts. Very unique design.
The combat itself is a bit on the basic side. I feel like the addition of a "light attack" at all feels superfluous. Maybe, since you get to position yourself in relation to the ghosts before combat starts, some spells could take that positioning into account? Something like a targeted heavy attack, and a weaker light attack that affects a small radius around the enemy. Enabling the player to "end" the reveal spell early to reposition could also make for some cool strategic decisions.
As for the aesthetics, this looks and sounds really good! It feels like a complete package in that front, and that's hard to achieve in the span of a jam.
Good work here. Keep it up!