Idle Heroes - Fantasy Arcade

Idle Heroes added a new building on the main screen called Fantasy Arcade.  It looks like they're planning a variety of game-in-game adventures in there, but right now they just have one that's a tower defense game.  

 

I never liked tower defense games much, but they made a cute little distraction out of it.  Each time, more waves of bad guys come to fight, and the waves get tougher.  You have to keep up by summoning new fighters as you lose old ones, and you do get a few chances to level up those guys in between attacks.  When these games are well balanced, like this one, you have some waves that knock you back but then you get control and push them out again.  But they do tend to drag on for a little too long.

Idle Heroes overall just keeps finding new ways to expand, and add more tiers to the heroes, more quests and features.  It also seems to have some all new challenge screen every week.  Like this Fantasy Factory one where you get a Tetris-like set of hex tiles to try and clear the whole screen of all creature icons.