TBH, i have rated this game after playing it once. but then i played it several more to figure out what to write. first thing first. It's a solid completed game with good graphic, music, character designs and game mechanic. It's impressive for a one-month game jam. Also it's agressively trying to include as many themes as possible. Theme Interpretation is definitely max.
I do get some small problems during gaming. i sometimes can't decide to shoot from ground or fly and shoot from side. also when characters fly, it seems it can't change shooting direction between left and right. maybe it should just auto face the enemy? And it's probably better if the invincible time after hit can be longer, or it triggers a bomb. I sometimes get frustrated and continuously lose hp. or maybe it's just me not good at bullet hell game. (glad there is infinite continue)
And then here is a thing i am considering. I can tell this game get inspired from Touhou, to the point there is quite some direct copied elements, like the effect of spell cards. If it's some necessary game mechanic, then i understand. But for visual, i guess it's better to be more original, or copy ideas from another source. (fun fact: when i was developing the first Song of Morus game, i had a nervious feeling that it's heading to Touhou-like, so i was purposedly trying to make difference. )