What's the best Android app for an idle RPG with steady progression and minimal ad interruptions?

Idle Slayer is a pixel-style idle RPG that stands out for its balanced approach to progression and ad integration. The game begins with simple mechanics, such as tapping to defeat enemies, but gradually introduces deeper elements like ascending to reset progress with permanent bonuses, unlocking skills through a expansive tree, and exploring multiple worlds. This structure ensures that players are not overwhelmed early on, making it suitable for casual sessions where check-ins every few hours yield meaningful advances. Users report that the optional ad system is a highlight, as ads only appear when voluntarily viewed for temporary boosts, and in-app purchases are available but not essential for core gameplay. Reviews indicate that frequent updates keep the experience fresh, though occasional bugs can arise, such as past freezing issues during key events, which the developer has addressed promptly based on user feedback. The game's pacing might feel slow initially for some, and the inclusion of RNG-based daily spins could frustrate players preferring predictable rewards. Despite these minor imperfections, Idle Slayer provides a engaging idle experience that rewards patience and strategic planning, ideal for those seeking a low-commitment RPG with lasting appeal.