For people struggling with the gameplay:
-use your onmyoji points to upgrade your summons, they are way more important than skills
-summon a lot of allies (they can move and attack as soon as they are summoned) and try to capture all of the spirit veins (glowing points). They will restore HP and SP to any unit on it, and capturing them will prevent enemies from spawning from them. Just park a unit on the beacons near enemies until you kill the enemies nearby.
-the AI is very abusable. It will try to capture the closest open beacon, so the movements are predicable.
-water-type units can traverse water (this goes for enemies too), and wind-type ones can fly over terrain.
-highly recommend using the purification charm, it will cleanse status effects and give status immunity in an AOE. Zashikiwarashi also has this ability and can heal, making her very useful
-Sayaka is unfortunately very slow (has low movement for the entire game). Swiftness spell can help with this.