Cool an adventure game :D. And filled with that charming adventure game logic the genre is known for. I’m a fan of the art, and the animation of the snake eating the man was very amusing. But you had all those lovely backgrounds at the very end without there being anything to do but rush through them!
I’d say I did get stuck at one point, and only accidentally managed to get the mouse, as I didn’t see an interact icon. Also I wasn’t sure of the reason behind the order of the passcode, I’m assuming something to do with the shapes/colours, but the meaning escaped me. Otherwise I found the game to be excellent, great job!