You really can't make progress without constantly checking in. Trimps is really cool and has a lot of content, but it trends too much towards active play for my taste. It speeds up a lot after that and should offer you a few months worth of content before you hit the end-game. Kittens Game is also really cool, even though the first prestige can take a few weeks. You can play on Kongregate, but I do recommend the Kartridge version in the long run since it runs a lot better than the browser version. This is key to what makes the game so good, as there's always something new to look forward to down the road. Only about 8 months in have I unlocked all of the features. Once you reach what appears to be end-game, you'll be able to restart on a higher difficulty which offers even higher rewards and more features for you to sink your teeth into. On top of that, you'll find challenges that you can take on to give you even more permanent bonuses. Some offer temporary bonuses (for the current rebirth), and some offer permanent bonuses. Along the way, you'll unlock about a dozen or more new mechanics that all work separately from each other. Soon, you'll realize that Adventure is actually the metric for your progress and the bosses are only secondary as they allow you to adventure in new zones. However, you soon notice that there's an Adventure feature where you equip gear and level up the gear to progress further there. NGU Idle starts off as a game where you raise your attack/defense to take on progressively higher bosses, where you can rebirth and increase your multiplier for the next run. 4G is currently working on a Steam version but we don't know when it might hit. Downsides? It's only available on Kongregate or Kartridge.

It has depth, a shitload of content, and offers great flexibility in terms of idle/active play, even though it trends more towards idle most of the time (checking in every 24 hours or so works well for me). I'm getting closer to end-game now, but he keeps adding content just fast enough that I've always had something to look forward to. I've been playing it for about 250 days now.

It's ugly, but it is absolutely worth your time if you're looking with something with some meat on it. The best incremental out there by a landslide, IMO, is NGU Idle.

Rapidclick github