Finally beat the boss with all four playable characters on Normal Mode, so I'm going to start increasing the difficult level.
At this difficulty level the game feels way too easy. For example, this deck was all over the place and very unfocused and it still destroyed most fights (7 perfect elite fights). I'm barely even using my spell bomb and there's almost no downside to taking as many elite fights as possible to rack up the relics1. This game still doesn't feel as strategically "tight" or balanced as Slay the Spire, but it's still entertaining. Maybe it will get better on higher difficulty levels.
Starlight Convergence+ very much carried this run. The strategy was to rack up a bunch of energy in one turn using "Borrow" Materials+, spend it on Starlight Convergence+, and use my very heavy scry (from Astrology Study+ and Stargazing+ and Cleansed Crystal Mirror) to play that Starlight Convergence+ almost every turn.
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My understanding from my friends who are more into Touhou is that it's very appropriate for Marisa to get the Thief score bonus)