I think the concept is pretty solid for a game in the early stages of development. Positioning tends to work well in RPGs since it adds a lot of possibilities for interesting encounters, and the frog theme is cool because frogs are cool. Also, the best character in Chrono Trigger.
On the topic of suggestions, I think the game really needs a button to go back and pick a different attack and some kind of balancing mechanic for special moves. Perhaps having more than 1 action point available per round could be sufficient to establish a trade-off between movement and high damage/large AoE abilities because they can be assigned different AP costs.