I played it for a while and wrote down some notes.
I liked the graphics and sounds. It was quite cute and seemed to all work together. It was also easy to understand and play.
The fire was fun to play around with too. It was cool seeing the fire spread and lead to trees burning down and boxes exploding.

I thought the actual combat was a bit flat... I've never really been a fan of enemies that just run at you. I think it would be fine for a specific enemy type, but when they all do it; it makes all the combat feel the same. I found that if you just stand still and time your hits, you can just use the same technique for all enemies... and if there's lots of them, you just run past them and let them walk to you. It also felt odd that the enemies would just wait in place until they saw me.

I think I'd suggest looking into some basic path finding (quite a few enemies would get stuck in place when trying to chase, or walk into the fires) and trying to spice things up with some different state patterns for each monster. For example, one of the enemies with a sword might try to follow the player, but find locations that are slightly out of striking distance (I imagine that you could just do a ray cast to find an open position), then lunging in for an attack and quickly moving back again. Maybe some could block, so instead of pushing them away, they push you.

I think a little more visual and audio feedback would help. For example, adding a sound and some sort of colour change or particle effect when drinking a potion. I also found it weird that when I killed the large heart at the top of a tower, I just sort of teleported outside... It feels like there should of been a musical sting and a fade out or something.

I also found it odd that when I zoomed out; the gameplay paused. I'm guessing it's so you can look around and plan, but it just sort of felt odd.
I'm also a bit perplexed about the rolling... I thought it was neat, but I didn't really find any use for it. Running past enemies seemed to work fine and I was a little disappointed that it didn't help when you were on fire (because, y'know; stop, drop and roll). I'm hoping that if you expand the monster attacks patterns, it might become more useful.

Hopefully some of that was helpful. Good work so far. Seems like it will be a fun game :)