This game is really fun because it has so much customization and lets you pretty much run your hotel how you want without requiring payment for premium features.
This is a great game. Not just another typical tower defense but a lot of variety and upgrades unlike I've seen in other games. I think that this will appeal to people who are experienced with this type of game as well as people new to the tower defense style.
 "Innkeeper")
 "GemCraft Labyrinth")
 "Simple 4 in one row")
 "Bullet Heaven")