Thank you very much! It was the first time I'd done pixel art, so I'm really pleased that you think what I've done is pretty! For the characters, it's normal for the level to reset if only one of the birds touches it, so both have to touch it at the same time. We haven't had time to develop the story around the game, but basically the person playing is actually playing the same game. She's just trying to complete a challenge, which is to finish the game in split screen mode, on two different screens, which explains the reset, because to complete the challenge she has to finish everything at the same time.
Thank you very much for your feedback on our game!