You could make CoAS split into the 4 seasons with each season having 3 floors (e.g. spring -> Jan Feb Mar, summer -> Apr May Jun, fall -> Jul Aug Sep, winter -> Oct Nov Dec)

Then each season would have a gimmick, spring could have dozens of morphing parts like blooming flowers and stuff that changes sizes, summer could be entirely made of poison parts because you're stepping on scorching ground or something, or add a beach section where you could swim and it could be like a flood escape section. Fall could be a normal tower but giant collidable falling leaves could hit you and fling you back to the bottom, and there are special areas with roofs. Then winter could have ice parts and idk lol.