1. Eventually the cover needs to be redone a bit. I do like it being Rin, except usually the silhouette is the cutin used in the game, which means we might need some Rin cutin by Slaves (assuming the final spell will have a shadowed Rin cutin)
2. Jesus fuck why are we already on yukkuri
3. I honestly don't think using 東方 is a problem unless we decide to y'know sell the thing or something. We're already using 東方弾幕風 to code it and there are tons of other fangames prefixed with 東方. 全方 is more or less "all-around", so it could work too if you want to go that direction(pun intended), though.
4. 「我が名はゼンガー!悪を断つ剣なり!!」 (you do know zengar is based on an srw character right)