Thanks a lot for the very detailed review. It helps a lot.
For the damage sfx, I guess I should have raised the volume for it a bit higher since it gets easily buried within the music; making it not that noticeable. As for the level progression in terms of points, yes I agree I'll be implementing that change in my game's next update.
For the acrobatics stat, I think I'm going to buff it by implementing an extra mechanic to add a chance to negate an enemy's damage in the next patch. I'll also make sure to make the game harder in the late-game to keep it challenging and interesting.
As for the scaling, there's actually already an automatic difficulty scaling. The amount of deaths just makes it faster to go from difficulty 1 to 15 compared to having no deaths.
Overall, thanks again for the detailed feedback as it really helps me a lot in terms of game design.