Yeah I've heard the difficulty may be too high and plan to lower it.
However, if by wasting a turn you mean the ability Focus, then I have to disagree, since is one of the most broken skills at the moment. It may look like a wasted turn but have in mind using it in combination to a CD or TP skill will effectively count as using that ability twice ignoring the wait and TP cost. Example Focus+Heal+EnergyClaws translates to using somewhat twice a heal and twice Energy Claws without needing to wait for Cooldown in the same turn or collect more TP. Increasing the power of it would break the game completely.
As for the potions, remember you can use them before battle. Even though I plan to look into them while balancing the game as the development progresses.
The nature of the skills may change though, there will be more abilities in the future and I need to rebalance everything to make sure all of them are usefull. Despite me disagreeing with Focus I'll take the feedback in consideration.
Thanks for playing!