Hello there! I love the concept and I don't know if the first stage is final in its design, but the boss is wayyy to dificult to beat. It would require an enourmous amount of grinding and the fact that the game freezes when you you're not actively on the browser tab makes it an almost impossible achievement. I would have to leave the computer open with the game tab focused for 2 days probably :))
Nice work so far regardless!