When you lvl up in something you well don't see much of an increase now don't take this to seriously like making one level increase you to be able to run across the world but maybe 10 levels and you can run from point a to point be 3 seconds faster + make it harder to level up because my run increases every two seconds sry for being kind of, well.... a lot of whiner but I love the game nonetheless.
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The level system isn't perfect, but I've been thinking about adding a perk system which you get a new perk every time you level up.