This game is hilarious. If you're familiar with the series and you'd like some comedy then this is something you must try. Although the kerning in English is seriously messed up, it's still readable and the presentation was unexpectedly funny even without actually reading it. (It's impressive that the game even had language support to start with anyway)
Everyone is slightly animated and the concept of mixing roguelike deckbuilder with shmups is quite refreshing. You can also feel the beta art style from StS in this game's card arts.
So the game isn't just about roguelike dungeon like StS. You also play like a shop simulator interacting with others in Gensokyo and there are some main stories about Rinnosuke's ambitions as well.
However the card battle part of the game isn't really as entertaining as the narratives -- you only throw cards randomly at your opponents and hope the bullets will hit. It's both an innovative and a complicated concept that can easily take weeks and months to implement though.
Overall it's been a great demonstration of the idea with interesting narratives. Rinnosuke as protagonist is also worth some extra credits ;)