Thank you for playing my game! You raise some very good points. I think changing the show button to something more descriptive is definitely a good idea.
Yeah unfortunately the battle mode is a bit basic at the moment but it's on my priority list to improve. For example each familiar has stats that in future updates will affect the battle more. Every element will also give stat bonuses each time you level up depending on its style i.e. Earth gives a bonus to defense and attack stats.
Thanks again for playing,