Is it just me or does Sakuya suck.. I mean. She has the biggest hitbox, she has garbage bombs, she has low damage, with insane spread, but not even homing. I mean what about her is good that I'm just too dumb to understand at this point.
She may have low damage, but SakuyaA does have 4 bombs, which means significantly more "lives" to get through the stage. And she does make up for that low power with homing shots. SakuyaB, however, I don't think there are any advantages to using her besides a really long time to execute a bomb, which Gil uses for his no vertical Phantasm run, and that seems kinda useless.
Some of the Touhou characters are pretty unbalanced, but what're ya gonna do haha
Also, from my experience, I'd have to say that the cheapest games are in this order from most to least:
IN has tons of weird spell cards that you just have to memorize, and a lot of them involve streaming, so you'd have to know where to place yourself. As a result, you have cheap cards that involve more memorizing than dodging and overall incredibly hard to do without getting familiar with the game.
PCB is a very friendly and fair game from the start, but starting from the last spell of stage 4 it starts to get bs. Stage 5 has some cards that are so dense they will definitely take a while to learn, and Yuyuko has the most annoying homing attacks ever. If anything is unfair in this game, it's Yuyuko. Lots of streaming that eventually traps most people in corners and such.
EoSD can be quite difficult, but most of these attacks are sightread-able, and to be honest, the few parts of the stages that are annoying can easily be bombed through. Sakuya's patterns are difficult, but not as dense as Youmu's, and Remilia's attacks are just plain hard, but at least they're doable, unlike Yuyuko's attacks, which focus on heavy homing.
SA is a very unfriendly for beginners because of the overall speed and unusual patterns found throughout the game. Stages are especially tricky to do your first time. For the most part however, the spell cards are very fair, although some of them do have gimmicks that will almost throw everyone off the first time. Luckily, bombs are based on the power system, which is the key reason why this is below PCB.
MoF is a great game because the patterns are very true to the bullet hell genre. Very few elements aren't fair. The cards are clean, simple, and creative without straying so far that it will catch you unexpectedly. And, bombs are based off the power system, so you can bomb as many times as you need.