Cold planets should have more than freezing screens they should have their own background like hot planets
Chickens should wear icecaps and jackets instead of shirts which make them move slower
Snow balls like asteroids spawning in middle of waves with difficulty > 40%
Frozen chickens in ice cubes that spawn chickens like eggs but you can see through and will drop ice shards that can destroy you when broken
Frosty satellite that can be used for turning chickens to ice cubes but it will make them fall on you if you over freeze them and can’t be used in hot planets and stars
Frosty UFOs that can throw snow balls on you