Cave Exploration

It's a game where you clear caves floor by floor, collect loot, upgrade, and level up. Roughly every 10 floors in each cave, a boss appears, and it's fun to defeat them. You can also grow your character through a skill tree based on your choices, and it seems important to utilize it well since relics have options to upgrade skills by 1. I'm still a beginner, but it's quite addictive early on.