I don't know if it specifically increases due to level, but later stages definitely have some crazy shit going on.
I'm level 42, playing a Conjurer (occultist + shaman) that summons pets and is supposed to let them do all the work. Unfortunately I'm still too much of a melee mentality and I get into the mix all the time, but eventually I hope to be tanky enough, and I can always run in circles. I have a serious problem though, I want too many skills so I've got just 1 point in the ones I want while I push to 50 in both masteries. Currently I'm at 50 in Occultist and 40 in Shaman, so almost there! But if I had 12 points in the shaman bramble pet and occultist hellhound, they'd probably be wrecking shit a lot more than currently. But then I wouldn't have all the cool shit!
I'm absolutely loving this game, and knew I would, as it was the game that popped my Kickstarter cherry. My only complaint is the vast amount of skills that I want to use, and could be using (including devotion skills and skills granted by gear and augments), but simply don't have the slots to use them, let alone the manual dexterity to hit all those different fucking keys. I already have most of my second toolbar filled as well, what with 3 pets and 4 passives I have to cast. Other games like this I can usually narrow it down to a few truly great abilities, but this game seems to have soooo many that are worth using. Not really something I usually find myself having an issue with, but this one is really noticeable. If I could tie multiple skills to the same key that would be a godsend, but I understand why they don't allow that. Still, that's the one thing I wish for with this game.