Mucho Taco is a bad idle game on iOS that first might have been a cool cookie-clicker rip-off but instead does nothing new or interesting with the genre and eschews some of the things that I would expect in an idle game. With bad core controls, slow progression and random consumable items, it's not a game I'd recommend to anyone.
I've spent so much time on Adventure Capitalist. Countless hours tapping things to upgrade them so I would get enough money to buy more things and upgrades to get more money to do that ad infinitum. Then you reset your things but you get even more money next time. And the numbers go really really high and you can buy things to make the numbers go even faster. It's basically the only iOS game I've played so far that made me watch its ads gleefully - because it made the numbers go faster, and watching a 30s ad is always worth it to do that. If you like idle game - which I'm not sure what that says about you, or me - you gotta try this one.
Time Clickers is an idle game where you have to shoot at cubes to destroy them. Doing so nets you money, which you use to upgrade your pistol and to buy other guns that auto-shoot at cubes to destroy them. Doing so nets you more money, which you use to upgrade all of that stuff until you get to a level where the cubes have so much health that you can't get through anymore. But never fear! You get special Time Cubes at certain levels, and you use them to upgrade many stats, in order to be stronger, to be able to destroy more cubes. You get the idea!