1. The game is engaging, though the arena sections feel a bit long, at least for being part of the intro area. I'd also recommend having enemies spawn randomly within or near the edges of the arena, as opposed to the immediate center.
2. Sound effects for getting hurt, enemies finishing their attack, and the player missing their attacks would help a lot with game feedback. Otherwise, the sounds are great!
3. Combat feels good, but the parry locks the player for a long time, and the spacebar ability feels pretty underpowered. I'd recommend upping the damage, and change the extra bar segments to either increase the damage or simply be separate uses, as the increased AOE doesn't do much when all the enemies are surrounding the player so closely. As of now, it's really easy to just stunlock goblins with basic attacks (which can hit multiple enemies) and never use anything else, which feels fun but leaves the other mechanics unused.
4. The game is pretty short right now, I'd recommend extending the length of the two regions, maybe add one or two new areas if time allows for it. Having multiple enemy types would be great as well, perhaps some that can't be stunlocked at all, some that need to be fought with a specific high/low attack, or ones who shoot at the player from afar.
5. The difficulty feels nicely balanced so far.
6. The visuals are great! I really love the 2.5D style, it's very unique!
7. There were no problems with performance.