Now that we have balloon chickens in CIU, pop till they drop seems like a no brainer.
Chicken Carousel is pretty similar to Rolling Ball ‘o’ chickens so I dunno about that.
Reinforcements was pretty long and not too exciting in CI3 IMO. I’d prefer it to be an upscaled version with four chickens coming from top and three columns of two chickens coming from the bottom two corners and the bottom like this:
Orange: Chickens coming from the top
Green: Chickens coming from the bottom
With this, a 125% zoom might be necessary.
As for missile strike, I also want to see those enemy missiles be reintroduced in CIU. But it seems that they might have made it into the list of deprecated enemies along with those egg-rocketships and UFO’s that shoot ions instead of laser beams.
And Chicken Geometry already exists in CIU.