Days+bygone+guide+new

During a run, killing enemies drops experience gems. When you level up during a run, you are offered a choice of temporary buffs (e.g., increased damage, attack speed, or multishot).

Most online guides (Reddit, Discord, YouTube) recommend: days+bygone+guide+new

Guide quality:

This is where you spend Gold (the primary currency) to permanently increase your stats. These upgrades persist even after you die. During a run, killing enemies drops experience gems