It's so GOOD. Completed its first ending today with about 3 hours of playtime and 41% of secrets discovered. I somehow fumbled my way into beating most bosses on my first or second try but the last boss really forced me to learn the combat properly. Learning it was pretty fun though.
The amount of secret rooms is pretty insane. I thought i cleared everything when i found all the ? rooms on the map but then i found out the pause menu gives you a percentage on the amount of secrets discovered, and it was only 19% at the time. I did also discover the big secret place which I'm excited to explore after getting the first ending, since I assume there is a second ending behind that.
The one criticism i have though, is that kokoro's wall climbing is painful to use, especially when trying to jump on the opposite side of the wall, since letting go of the movement button immediately makes her fall down, which means a jump from the wall to the opposite side is practically impossible, unless it is intentional for that? Atleast Kokoro does have an infinite amount of dashes while in the air. Flying through rooms like that is pretty fun. Also, some spells have a really big discrepancy in the amount of damage they do. Patchouli's side magic is a nuke compared to everything else. while kokoro's down magic does so little damage for the amount of set up it needs. Patchouli's up magic is also pretty limited due to doing such a low amount of damage that kokoro's up is just better by virtue of giving you some breathing room due to how long it lasts, and potentially outputting more damage if you position yourself right compared to the boss.
Finally, the music is really funky. I like it. Especially the soundfont used on the bosses' themes. They are pretty nice.
This game is a very solid tribute to both hollow knight and touhou, and it really quenched the thirst for some fresh hollow knight-like experience while waiting for silksong.