Hello I have some ideas to new version of chicken invaders univers.
If possible, reddish the yellow shell of some chickens.
2.Give a gift for the MoronRailgun bullet.
(It is better to be Ion blaster flash)
3.Do not adjust the sound of the chickens dying,on the clothes, but on the face.
Thick sound or
Thin sound
Semi-thick sound(But thin sound is also good)
Semi-thick sound
But exceptionally, this chicken has a very thin voice
4.Ordinary chickens add all the games. These two chickens need to be renewed This is for CI3
5.Add CI3 waves and characters too.
6.And add this CI2 chicken too.
6.This metal suit chicken is better to shoot this bullet .
7.Add Hen solo’s spacecraft.
8.Add Feather Fields of Yolkon-7 waves.
9.Create a boss for Feather Fields of Yolkon-7 waves.because all the mission successes have a special boss.
Just going to bring this one in particular up because it has issues…
Hen Solo’s ship is basically the Millennium Falcon (I know it’s not, but it’s not an obvious parody, either, like the Yolk-Star™ - it’s basically the same ship).
Now, in CI4, there’s nothing wrong with this - he’s a side character and an obvious nod towards the Star Wars franchise. Many different movies and games do this.
But in CIU, player ships are purchased with keys in a free-to-play fashion. All of a sudden, something that was a harmless side joke in a previous game could be seen as profiting from the franchise in this one, because players would be using in-game currency as a way to unlock it.
Plus I feel it would be weird to have too many of these scattered around the galaxy…
Some of your other ideas have merit, though (although many have been suggested before )
These two chickens need to be renewed 
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