Stage Idea: Amusement Park (Nier Automata/MediEvil)
The stage starts out at
the amusement park from Nier Automata, featuring robots in the background that throw confetti and dance, along with a tank that's been modified to shoot out confetti. The robots don't hurt you, and in the background, you can see the roller coaster moving around the track. After a minute or two, graves and medieval architecture rise from the forest on the outskirts as the sky darkens and a bit of fog rolls in, and
zombies from MediEvil wander into the amusement park. They're slow and lumbering, but they still manage to push the robots over since they're not fighting back.
The Pumpkin King sprouts out of the ground in the background, resting on the building behind the statue. (also, you can see some zombies getting on the roller coaster)
Unfortunately for the zombies, their actions manage to awaken the
Amusement Park Rabbit statue, and since that's a level 80 enemy in the original game, it beats them and the Pumpkin King in short order. The few surviving robots go back to their routine as though nothing happened, with the Amusement Park Rabbit joining in.
The stage doesn't have many hazards, since all of this is happening in the background. Maybe when the Amusement Park Rabbit beats the Pumpkin King, the giant pumpkin head flies off and lands in the foreground, where it can act as a platform or barrier. (or deal damage when it initially lands)