I've played with this sort of equipment system in mobile gacha games so it wasn't too hard for me to figure out.
That's great that you didn't find it complicated! In this game version, there are no tutorials or guides. Currently, I am working on a new major update that will add more content to the game, mechanics, and enhance/improve the combat and missions.
Can't wait to try it out when you update it. I like the design of the girls so far.