"Indiana Jones and the Great Circle" made an interesting choice where they gave you more ways to earn XP than they did ways to spend it. Which means once you get to spend it, you're not trapped asking if you really need this or that skill. Who cares, it's almost free, might as well try it out.
As far as immersive sims go, this one's pretty casual, and I have no problems with that for now. Let's see if the second biome manages to keep things interesting.