I like the boss design, they both felt pretty fair yet appropriately challenging, and it was fun to try to optimize their damage windows, like by running ahead of them and holding up. I also appreciate that you can hold the attack button, no mashing required!
It’s a bit lacking in polish (stuff like no HP bar and lack of feedback, like other comments have pointed out) and with the lack of actual character upgrades, it’s not much of a Metroidvania, but it’s a solid action platformer.