Maybe. I think the scaling just felt off if I were to get stuck on, say, stage 2, and suddenly the levelups seem to stop for a long while, but after playing a bit more it looks like if I don't die the first time I clear each stage, then the XP scaling is plenty to get 3 or 4 levels a stage if I'm thorough. So I agree that making the first couple stages give more XP would help since I feel like that's where a new player is likely to get stuck, but I guess it is a pretty controlled progression already which I can understand since that makes it harder to overlevel. (And to be fair, maybe my expectations were too high for what level I should be able to reach since it's still only a demo...)
Also, it turned out the skill tree lets you out of the basic tier way faster than I had thought, I was leveling the talents evenly so I thought I had to complete the whole thing, I guess I got confused by the wording in the guide