What is max LVL in All Star tower defense?

Excuse me, could you please clarify what you mean by "max LVL" in the context of "All Star tower defense"? Are you referring to the maximum level that a tower or a character can reach in the game? Or is it perhaps related to the game's progression or some sort of achievement system? Additionally, is "All Star tower defense" a specific game that I may not be familiar with, or is it a more generic term for a type of game? I'd appreciate it if you could provide more context or details to help me better understand your question.