Hi raulboo, I like the cute vibe of the game! I think the player bird is a little hard to see and control tbh. I think I understood what you wanted to do with the wings - kinda like a gliding mechanic, but right now it feels like he's rocketing downwards and is a little difficult to steer.
I also agree with bobfox about the art, nothing much I can add there. That being said, I'm not a big platformers fan and the best thing I would suggest about design is play games with the gliding mechanic. I think King's Bird is a good example. But I'm sure you can find a lot more!
It takes a while to nail a good mechanic, but keep at it! I wish you all the best!