update: haven't had a crash, in a day, but if you exit the game to take a phone call or text or whatever, it kicks you out and you can't pick up where you left off... fun game to kill time. however, using the watch ads to get +100 in-game cash (up to 3x) freezes/crashes and you lose the game. logging back in restarts the game and you lose your place, also random mode is not worth the headache

It's a perfectly fine tower defense game for the first fifteen or so levels. After that, you'll have upgraded all of your towers to maximum, so there's no way to get more power. There's no way to increase your starting budget, so you have the same amount of money to buy towers with. But there's still HUNDREDS of levels remaining. The pointless grind is overwhelming.

Started great, but maxed weapons out by level 10 or so, and that got boring. Upping weapons is fun. By level 55+, it starts getting challenging. Power ups will be needed. It's so much that it's just silly. Fun game, but will probably find something more,"upgradable." / skill based, not just power ups, and grinding.