Very enjoyable game. Just a note: It took a while to load onscreen (webGL) so i suggest uploading an exe. No one likes a long loading time.
Platforming is great and with a few polish here and there. It can be great. I suggest creating an invulnerable stage for 5 seconds or so when the chicken gets hit - and it flashes visible-invisible and/or a mild knock back when hit.
You've done a great job so far. Keep at it. Make sure finish the game.