I couldn't play the game well because screen size was really small and I think it didn't correspond to the original resolution of your game. It seemed pretty fun though, if you solve that problem with the screen size, let me know, I will probably give it another try. I will rate the game anyway, keep going :)
Edit: I managed to resize the game by zooming the screen. I was hoping to see a boss appear or something but nothing happened, maybe I couldn't get far enough and it's my fault, if that's the case I'd really like the boss to appear earlier so it's not so repetitive at the beginning. Good job!