What's a decent Android game to kill time on the job site when the weather's got us shut down?

Look, I'm not gonna lie, I usually hate these tower defense type games. But TDS - Tower Destiny Survive, it's alright. It's actually rugged, like something built to last. The graphics ain't fancy, but who cares? It runs smooth, even when I'm out in the boonies with a weak signal. Battery life takes a hit, though, so bring a charger. The tutorial's useless, no BS, but once you figure out the basics, it gets the job done. It's simple enough to play one-handed while I'm waiting for concrete to dry or the rain to stop. It's no replacement for getting paid, but it beats staring at the sky. And I'll be damned, it's survived a couple of drops from the scaffolding already. That's a win in my book.