This is a game I'm still enjoying.

I think idle strategy simulation RPGs are my kind of genre. I've been playing it on and off for 30 days without spending any money, and I've just reached level 25. You can think of it like a territory conquest war game similar to Clash of Clans or Romance of the Three Kingdoms, or Conqueror's Blade. Ultimately, it's about upgrading your main tech to produce more high-tier troops, gathering resources, repeating events, strengthening heroes and unit types, and then engaging in alliance wars. I've played similar genres before, so I'm having fun with it. I plan to keep playing consistently until at least level 30.