The main mechanic is a great design concept! The tradeoff of speed vs strength lends itself to some complex strategies. The visuals were solid, especially the cover art and the attack effects. It does seem that right now, just waiting a while to charge up seems to be the best solution to oneshot the enemy. Perhaps there could be some kind of overheat mechanic to discourage that (or just balancing hp/dmg values). I also think the game would massively benefit from sound effects. A countdown based rpg combat relies on noticable triggers more than most, though I understand the time constraint doesn't really lend itself towards perfect sfx design. I would say this is a great job for a jam game.