Small little thing but unless you're going to have only 1 team be able to hit the final level can you not call it "the tyrants" because eventually there would be many teams with the same name the suggests a singular power.

To make it great all you need is leaderboards and a solid upgrades system.

Another suggestion would be team wars, where 2 teams compete to gain the most XP in x amount of time.

Small little thing but unless you're going to have only 1 team be able to hit the final level can you not call it "the tyrants" because eventually there would be many teams with the same name the suggests a singular power. To make it great all you need is leaderboards and a solid upgrades system. Another suggestion would be team wars, where 2 teams compete to gain the most XP in x amount of time.