In your description you wrote, "I can't be a lone programmer apparently."
I think you're being way too hard on yourself. The boss may have only had the one state, but I still had fun dashing around and getting hits in. It was even challenging enough that I died and got to hear one of two great original songs for this jam game! That's a lot of effort. Not to mention really charming art and animation. The smear frames on the attack sprites are really well done and help sell the impact. I think the hitbox could have been a little larger, but the potions helped make it more forgiving when I'd take impact after sneaking in some swipes. Loved the tileset, thought the sfx were great.
I don't think you need any additional feedback on the game itself. If anything, you probably have a dozen ideas you would have liked to implement, and I'm sure they're great, because everything you did manage to fit in was awesome. So I don't have any criticism, but hopefully encouragement. This was a fun jam game. You clearly have a lot of love for this craft and are really creative. I hope you keep making games! One jam game doesn't determine whether you can make it as a lone programmer.
Great work here. Can't wait to see what's next.