Slugterra: Slug it Out 2

This is a portrait-oriented match-3 RPG that can be played in short, interruptible sessions, making it suitable for quick bursts of play. While it offers a high degree of replayability with numerous slugs to collect and events, the monetization leans towards pay-to-win, which may frustrate free-to-play users. It's best suited for players who enjoy strategic puzzle combat and don't mind the potential for pay-to-progress mechanics.