It's simple but pretty hard and a great challenge :)
Nicely done. Perhaps you should give achievements or something like that
I love the game, I really loved the 1st one and played it multiple times. But.. I'm not sure if this is a bug or what but the boss after the giant bird which is the last boss on easy, after him.. the two legged running monster.. after I beat him, the screen gets insanely laggy and explosions start happening everywhere, then pixels start turning black in giant squares in the middle of the screen. It lags to the point where I cant move.. so.. does that mean this boss is unbeatable or is it just some crazy huge bug that doesn't let anyone pass this boss? Because.. I've been sitting here waiting for the next boss to come or a completion screen yet none has appeared after 15 minutes.
I've played this game a lot and the one analogy that always comes to mind is you keep beating your face on a brick wall time and time again until the wall breaks but I love these types of games, that's also why I like bloodbourn, dark souls, and demon souls, its the same concept.