I started a new idle game yesterday called Idle Universe Online. It seems fairly interesting so far and has lots to offer.
For the most part you just kill monsters and progress through levels but there are numerous little mini-game type features that add a lot of depth to the game. There is mining, fishing, woodcutting, pets, guild and more. I find it quite interesting so far and one of the coolest feature is that you can group up with other players. I find it very nice because you can often find people higher levels than you that help you progress a bit faster.
I'm enjoying this game right now and have just been letting it run in the background while I'm doing other things. That's kind of what I like about idle games. You progress by really doing nothing and when you logon there is always a bunch of new things for you to do. It's like it just saves up a bunch of fun for you when you come back to the game.