I played the web version.
I played 3 fights. The first I did not use either of the Q or E special abilities as I had focused on the controls popup at the left, and learning how things worked and somehow completely ignored the abilities at the bottom right. I finished with about 1/3 of my HP. I wandered around after the fight looking for where to go and what to do. If there is nothing more, then it would be nice if you displayed something to tell the player it is over, preferably with some stats on the fight, but for a demo, just a you win/lose message would be good. I did not die, so don't know if you have a check for losing/death.
My second fight I tried using the abilities. I like the E ranged attack, though it did not pop up and damage numbers. The spin attack has too much knockback. On one hand, a knockback ability can be useful to give yourself some space against a group, but this is one on one, and you have a dodge ability to get clear, reducing the benefit of the knockback. With the way it spins around multiple times, it feels like it should hit many times quickly doing a lot of damage, but I found that it often hit once or twice and knocked the enemy clear of the damage zone. I could do far more damage with my basic attacks. Add in the delay to start it and not really being able to chain it well with the basic attacks, and I mostly ignored it after a few tries.
I also found that there is a dash attack when pressing a directional button and clicking to attack. I had done it accidentally a few times in my first playthrough, but did not stop to experiment with it. When I did experiment, it was not consistent, and I'm not sure if there is a cooldown, or exactly how the timing works to activate it. I tried a bit after the fight, but it did not feel reliable enough. I feel like there is a cooldown, but did not notice an indicator for it. It could just be that my timing on button press and click was not good enough to get consistent results.
I'm also not sure what the grey bar at the top under the enemy HP is for. I see it building up as I am actively attacking, and then draining, but I'm not sure what it means when it is full.
The combat works pretty well. This feels like a good start. A bit more of a tutorial or details on abilities would be nice, feedback when you win, and, of course, after beating the boss being able to level up and move on to another.