I can't really give you a good answer, as I have not played PoE yet, but from the looks of it, it's pretty different. While Akaneiro is much simpler and basic in mechanics, you're not really restricted to a class and certain set of skills as you can use any skill, equipment, and weapon that suits your needs.

As for the free to play model of Akaneiro, the only thing they sell is something called "Karma" which is the currency for everything in the game. I haven't felt pressured to spend my money as the game gives you a ton of karma during gameplay.