Okay, I really love this! The art style and general vibe were impeccable. I love the battle and it's a fun concept, the only thing I wish with the battling was that it was a little more intuitive for what keys I should be pressing, e.g. a more "guitar hero" style mechanic or some other way of being able to more easily link the icon to the key press. Maybe it could use the arrow keys, and you could gradually introduce each element with a rationale for the arrow? E.g. Air rises so it's the up arrow, ground is at the bottom so it's the down arrow, water flows downhill so it's the right arrow, and fire travels uphill so it's the left arrow? And just introduce 2 elements first, then the other two, then start to combine them.
It's also a little confusing in the battling screen how I have to sometimes select an enemy and sometimes right click to attack - I would've thought the combos would do the attacking for me! And I'm not always sure when I've dodged correctly.
The overworld was also very confusing, I kept getting teleported back to another room and I don't really know why! I'd love to see some more story in the overworld and something to connect the fights together, but the fights themselves were very fun!