Instead of just power-ups and enemy bullets only being hidden, what about chickens, the player, and any collectible items as well? Basically anything that’s visual won’t be layered on top of actual gameplay elements.
im thinking the layering (from highest to lowest) would go
Player
Bullets
Chickens
Power-ups (unsure if atoms over gifts or the other way around)
Collectibles (Keys, Food, then Coins)
some other effects that basically block what you’re capable of seeing
ICBM/bird-flu gun explosions (if not at least make them slightly transparent)