I really liked the aesthetic. Very good use of a restricted color palette.
Though, one or two more colors could help in conveying additional information. At times it was hard to tell what an item was until you used it. Some more distinct colors in the same tone could help communicate differences in items, and lead to other gameplay benefits (like item prioritization and remembering locations) without changing the overall aesthetic too dramatically.
All the sounds are cute and great. xD
My health didn't fully recover after death, which I felt was a little strange. I kept getting destroyed in combat, especially when I'm attempting to cancel the enemy's attack. xD
Either way, it was a lot of fun. I would love to see more to this!
Great job!