There is no difference imo at all. You might start noticing a SLIGHT difference at NL10, but that will be minor as well. So don't worry about that - people are often more scared when they move up in stakes and this affects their play in some way, as you get used to the new blinds and pot sizes (give it a few days) you're game will match the new stakes well and you will see that if you could beat NL2, then you can beat NL5 just the same. Just be consistent, and don't be afraid to move down the stakes back to NL2 if you feel it will help / your roll goes down significantly.

By the way, congratulations on the $100 in 40 days / 60k hands, not many players at the NL2's have the discipline to do that without giving in to the temptation of trying out the higher stakes. Good start imo.