Yikes… I have been playing the game for a while (awesome stuff!), but was always puzzled by the yellow ‘Leveled Up’ icon on the character’s thumbnails.
Initially, I thought it meant ‘This character is ready to level up’, yet when I checked the Perks section, nothing was accessable (not enough points). So, for a while, I thought it was more of a ‘This guy RECENTLY leveled up’… which didn’t make sense, but I happily went on.
Exploring the tool tips closer, I noted it still said I COULD level up… so, again, I was confused (…See a pattern here?)… but this time, I noted the mention of upgrading my skills. AH! Okay!…
Problem is, I couldn’t figure out how to access that screen. The skills display showed no indication of available upgrading, and clicking on it did nothing.
Only just now did I finally discover that it is accessed by clicking on the display of the character’s current level. Not entirely obvious, I have to say!… Especially when the Perks screen has its own access button. So, you might want to make it a bit more obvious (especially since the tutorials don’t mention it, nor does the tool tip for the level display itself).