I enjoyed it. It’s diverting and entertaining.
However, it’s pay to win, and it takes every opportunity to suck your real world money out of your pockets.
And, unless its changed in the last year, when you get a new phone or tablet, all that stuff you bought ingame is gone.
In the past, it was fairly easy to crack so you could get the for-pay content, like adding Luna and zapping the parasprites in a single round, so I was playing it with all the bells and whistles and at that point it was definitely fun … I’m not sure how much fun it is though if you stick to the free game by itself … Maybe if you had a lot of friends who were really active in it so you could leverage the gifts you might be able to get always in the game without paying.
Otherwise, about US$20 a month would keep the game growing and interesting, if you play it casually.
And at that point it’s not much more expensive than some MMORPGs used to be.