Frenetic mode could be an extra difficulty in the game.
In this mode, everything is sped up. Here are some examples to give you an idea:
- fire rate of player and enemies
- timelines (how fast chickens spawn etc.)
- physics themselves (how fast food, powerups and coins fall)
- move speed of enemies
I think that a speedup between 1.5x to 2x would be ideal.
What do you think about it?