things that could be added with this endless tower:
-seasons: 1 month per season? 6 months per season? --at the end of the season you earn a frame for your portrait that indicates the league where you were when the season ends.
-special portraits and frames: to those who were able to reach a very high position, the possibility to get an special frame and portrait. the should be able to put their league frame or special frame wherever they want.
-cosmetics/skins: the possibility to buy with diamonds cosmetics related to the season, for your city, townhall or the terrain arround your city or even a whole new terrain design that you can change in somewhere like when you enter to your townhall. imagine change the design of your townhall atleast!
-special cosmetics/skins: for those who reach to a high position or league at the end of the season.
-special great building: a new great building that requires no blueprints but "fragments" to unlock one level and FPs to complete those levels. the design should change according to your league or to your era. the amounts of fragments could be earn by wining fights, by a certain amount of succesfull fights or at the end of the season and depending on your league.
do you have more ideas?