Cool take on the angry bird genre ! I love the idea of using the chicken as a slingshot ! And the squichiness on those legs... *chef kiss*
You also got a good variety of level designs & mechanics for 48h. kuddos on that !
And I really appreciated the add of a next button to avoid staying stuck and see all the levels. thanks for that :)
Few suggestions to improve it :
-auto restart the level once you used all your eggs so you don't have to hit R all the time (especially for the levels with 1 egg)
-shorten the reload animation (to like half a second) to allow for fast fail & retry.
-make it visually easier to gauge the strenght of your shot to avoid player shooting at random (growing arrow, a bar filling up, or even display a trajectory line Scratch that, change the color of the chicken to a variation or red the stronger you pull on it, that would be hilarious).
All in all, it a very fun & funny game you got here. Great work !