If it hooks you, it'll probably be when you've completed a run, or at least gotten close to doing so (you get the victory screen and option to continue in endless mode). By then you should have enough understanding of the mechanics to start to realize how much depth of strategy is involved with pushing for higher and higher scores, and the random element provides that motivation to repeat, as well as a boost to the satisfaction felt when a build really comes together for you. Brilliant pick-up-and-play, easy-to-learn-hard-to-master arcade game with S-tier aesthetics.