Character XP, weapon growth and food upgrades
Quick answer
Character levels, weapon growth, food bonuses and Wind Gems are different progression systems.
On this page
Character and weapon progress
Enemies supply experience for character levels. Weapon use develops individual equipment. A character level and a weapon level are therefore not interchangeable milestones: fighting with only a favorite weapon does not automatically develop the rest of the arsenal.
Food and mobility
Food improves character statistics, while additional Wind Gems increase available air-dash charges. If an obstacle is a distant ledge, grinding damage is not a replacement for the missing charge. For a dangerous opponent, check damage type and the power meter before spending time on another level.
A practical upgrade check
Before repeating encounters, identify the problem: damage, survivability, movement or an unfinished collection. Select the progression system that changes it. Save after obtaining an important upgrade. There is no verified universal maximum-level or optimal experience-per-minute table in the available evidence, so this guide does not invent one.