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Pro Fun boss battles
Something unique to this title is that there are boss battles every 5 stages. This requires that the player is leveled up enough to defeat them thanks to the timer in the boss battle. If the player is not at a good level, they will not be able to beat the boss in the time limit, which means there is a bit of attention that has to be payed to the game in order to make sure ones level is appropriate to advance. Basically more attention has to be payed to leveling in this game than other clickers which makes for more immersion in the game.
Con Requires Flash
It's 2016, you should uninstall Flash. Even Adobe no longer actively supports it.