thats because this is based on an older version of pizza tower, WAY before the release. this was gonna be official but then got scrapped.
FUN FACT! its gonna be back soon.
If you have the game on steam, you can get cyop for an excellent level editor!!1
Though the level editor actually exists, you can place obj_solid, obj_slope, obj_cheeseslime and obj_forknight if i remember right
and also collectables i think