in the tutorial a shop in between fights is mentioned, I've never seen it
Hey Pinoo! Thanks a lot for the comment! There should be a small button at the bottom of the screen where you choose your next challenger called "Store". If there's not, try playing the demo version on Steam, it's probably in a newer version!
Also, feel free to join our Discord community to keep track of the game! https://discord.gg/9JS7RxtZ5u