Antenna Tower 1 has received less changes than it's Act 2 counterpart, but it's still worth noting them. Also, I decided to use the green Encore Palette for Ray Telezza here, which is why he and the bumpers are green.
There was going to be a boss named Bumpertron in the antigravity room with the button bumper in the middle. You can see this at the end of the preview techncolour posted on his BlueSky. It would've also incorporated the grate gimmick.
Sneaking Updates:
-The section is visually darker and has a dim light on the player.
-An option to disable the segment entirely has been added.
-You can pick between entirely disabling the speed cap, having a higher speed cap, or having the original speed cap while sneaking.
-There are 2 sneaking modes. The original, and a searchlight version, which is shown here.
Antenna Tower 1 Updates:
-The grate climbing gimmick from Deltarune has been added, replacing all instances of the moving conveyor belt platforms.
-A secret has been added. This is shown in the video. Discovering this secret unlocks the canon Ant Tenna palette, Velvet Cable, for use. From my testing, Tails (alone) cannot trigger this secret.
--NOTE: You also need the Egg from Launch Base 1. See this video: • Sonic 3 & Tenna - Secret Egg
For the original, see this video: • Sonic 3 & Tenna - Antenna Tower 1