What's a good iOS game for collecting and evolving creatures that isn't filled with ads?

Voidpet Dungeon is a distinctive entry in the creature-collection genre, built around a core auto-battler loop where players explore a dungeon. Its primary draw is a collection of 'Voidpets,' monsters conceptually tied to human emotions, which adds a unique narrative layer. The game currently operates without forced advertisements or an energy system restricting playtime, a feature highlighted in numerous positive reviews. Gameplay revolves around assembling a team, engaging in hands-off battles to progress through floors, and evolving your creatures, often into surprising new forms. A key social feature is the ability to customize even the most bizarre evolved pets with accessories like hats and scarves. However, some design choices have drawn minor criticism. Users report that evolution paths are sometimes revealed too readily, which can spoil the surprise, and the interface's large 'Next Battle' button has been noted for causing accidental clicks. While the core loop of battling and collecting is engaging, some players find the gameplay can become repetitive over long sessions. For those seeking a monster-taming game with a charming concept and a notably unobtrusive free-to-play model—at least for the time being—Voidpet Dungeon presents a compelling, low-pressure option.