review/analysis:

• background: i never really play shmup games, i have never finished a touhou, i played your game on browser on a Mac with keyboard only. I did 1 run with no continue.
• First of all, awesome game wow, the amount of polish is insane (I'm really moved by the sound design in menus lol). It's really fun too while being challenging. I'm usually not that into difficult games but i feel like yours has a really 'FUN' curve.
• I like the few choices the game gives you 'Should I kill the hands first?', or 'Should I kill the moon or the sun first?' (i ended just always killing the sun first and then building meter with the Moon).
• The 'slow down' mechanic is probably too emphasized when really it's no big deal lol.

I don't think we need such a dark screen when the effect really is just your ship going slower (which is maybe why some comment wanted it to slow down bullets too, it's really a dramatic effect when in reality it's not lol)

• Lots of designs choices I was skeptical at first, but after playing it I understood their points. Like for example, at the beginning of the game, I wouldnt even see the SPIN attack being launched because it automatically launches itself when you hold Z. So as a creator I thought "Wouldn't it have been better to have the player manually trigger it by pressing Z again? so you can see the big boom effect?".

But now I realize the game really was kinda designed with Auto fire in mind lol? (maybe that should be the default option? idk)

• Frankly your game could work on 2 buttons (or even 1), Z could slow down the pilot while youre shooting instead and X is for triggering SPIN lol.
• I thought at first the Spin was so weak, but now I understand more the philosophy of the game and see how you used it to design your bosses, and I think it's kinda busted now lol. Like you can just kill bosses in one Spin. Is that what you guys wanted? I almost never fought the beast guy phase of stage 4, because I was always going in with charged ready to kill it easily (also he seems like he has really low health for some reason?)

Maybe the damage could be scaled so it does more when you have few bullets charged and less when you have more charged? idk, even the tiniest change could really change the difficulty of some levels so that's kind of risky lol. Like the beginning of the game I had a hard time charging because there's relatively few bullets (which made me think maybe it's not worth trying to charge), but at the end it's charging so fast lol.

• Also maybe remove the grazing when you're invincible from respawning? You can get meter by just going to where there's a big density of bullets while you're invincible. Maybe you could remove the meter that reset when you die to offset that? (i wonder if it's really necessary)
• i like the shapes of the bullets matches their speed (round bullets are fast, lines are slower so you can go and graze them). and i like this purposeful design where slow bullet you try to farm them, but fast bullets you avoid them
• the touhou level is a nice change of pace, i liked it less at first (because all the bullets are rounds, at first you dont understand why you cant graze black bullets, it felt like there were less opportunity to graze slow bullets). But it really does have it's own identity with it's own phases (like that moment where she shoots beams of black bullets and you can charge super fast, but you have to stay within the zone delimited, I think that's really cool how it's like a different little game).
  
• you think you could put the Rebind in the option of the pause menu ingame? (at one point I was thinking of switching to a controller lol)

I would have liked to spend more time with the foetus maybe, I really liked at the end where everything gets faster and faster! But I didnt reach this phase enough (or I did but then I completed this phase without dying lol)

love the game!

fun but hard same satisfaction as undertale boses but better and love the art style

Wow, incredible! (and hard, but that's exactly what you want from this type of game). This is really special, great job.