I beat the boss.
The game is solid, I enjoyed it. It looks, sounds and plays like a NES game and controls very well with the right speeds of everything. The level design is good , one indicator being that there are plenty of places where you're not sure whether you should fight or run, when there's an obstacle to break and such. I really like that the area with the optional curse in the second zone is a hard one. The boss fight is a specially cool NES-style boss fight as well. The two characters are cool, I like them.
Thanks for sharing!