So it's themed around UFO and Ten Desires, huh? Well, that could be interesting, especially since I really do enjoy the cast of UFO. The point system seems to be an updated version of Sapphire Panlogism's mechanics, the graphics and overall art design are really attention-grabbing and colorful, which
can work in most cases. For the most part, Forlorn Souls of Wicked Past does the job very well, although that leads us into...
the character designs.
For this demo, we have the standard three stages with midbosses and regular bosses. Here, these are all canon characters, in order: Mamizou, Byakuren (Stage One) Futo (Stage Two) Nue and Miko (Stage 3)
I'll go over my thoughts on the redesigns for this game.

Reimu looks your standard Hakurei shrine maiden. Nothing of note besides the slightly changed outfit. I guess I should iterate that while the art style is pleasant to look at, I don't think it suits a Touhou game very well. That's just my opinion.

I like Marisa's color palette, being akin to a sunset with the blue leading into the pink. Personally, I like it!

Ichiran's certainly an interesting pick for a third protagonist, people would usually go for Sakuya or Youmu. I don't got anything to say since I don't think too highly of Ichiran. She's alright.

With Forbidden Scrollery and Urban Legend in Limbo, I've grown really attached to Mamizou as a character and design... and I don't think this one really suits her. What's with the arrows in her tail? Was she attacked? Maybe by Futo, who uses arrow-shaped danmaku in this game? I'm not too sure, but she's far from my least favorite redesign here. It's passable, I guess. Passable, but forgettable.

Oh fuck me, what did they do to Futo? Her whole schtick is that
she has trouble adapting to modern culture, so why is she suddenly wearing a hoodie and
pants? I mean, the colors are pleasant to look at, but taking away Futo's unique dress design in favor of bland sweatpants is a cop-out if I've ever seen it. Definitely my least favorite design in the game.

Nue... oh, sweet Jesus, Nue... What I loved about Nue's design in UFO was that it was easy to draw but memorable. The hat is cute, I guess, but the yellow jacket feels really jarring to look at. I guess it's supposed to represent... warning tape? I dunno, I just don't like it.

...that's just a fucking Fate Grand Order character.
EDIT: I FORGOT ABOUT BYAKUREN

I guess she's my second favorite design behind Marisa, but that's not too much praise. I like her colors and more saintly appearance here compared to her original design, but it's admittedly pretty forgettable.