Looks perfect for a Walking Dead themed stage.
Very small details.
-You leave the "debugbg" mode ON tuen it OFF this is only used when testing the stage cuz while playing cause a small FPS drop.
-Background deltas (BG1 and BG2) are too low. moves a bit fast for the distance a delta of 5,.7(bg1) and .6,.7(bg2) could work better IMO.
-Could set the "Fog" to Layerno = 1 so the fog afect the chars.
-Sugestion dont leave lines that you arent using on the DEF code like "layerno = 0"
You know for a 1st stage you did it very well.
Congrats man keep doing more.