Felt like playing again this morning, only died 5 times, I'm getting better!
Since it has so much potential I felt I could add some finer feedback:
There is a spot in the second level, near the first enemy, where there is a ledge below. I saw this ledge and thought to drop down to avoid the enemy, and going near the ledge killed me. I assume this was below a certain height that is programmed to trigger death, but it was really unexpected because you took the time to put the ledge there.
Now I realize the design intends for me to shoot through the enemy with the shuriken so I wanted to add something on that: Having to monitor the shuriken indicator in the top right can really take the player out of the focused, flow state that the nice music and platforming creates for them. It is usually better to have that kind of indicator near or on the player character itself because that is where the player's eyes are focused. An example of this is Celeste's dash which is indicated in the form of the character's hair color. Something even simpler like putting the indicator near the player would achieve the same effect though with less work and explaining. : )