Unlike the first game (which got kind of annoying with everything being underground), I actually managed to complete this one at character level 14.
While I’m not a big fan of puzzles, most of the ones here are thankfully logic-based and can be solved with enough trial & error. There are only a couple that require the use of specific items or codes based off obscure messages (and for those I suggest consulting a walkthrough). The biggest puzzle is really what sort of party composition to make and to determine that I strongly suggest reading through this character creation guide. Classes play much differently than you would think and you absolutely must have someone with a maxed out Alchemy skill.
As for combat, some of the encounters can be a bit tricky but none of the enemies ever come across as unfair or require obscure and/or unintuitive tactics. Really the worst I can say about the combat aspects are that when/where you acquire injuries seems to be completely random. Another complaint would be the hunger system, as I unilaterally hate all hunger/thirst systems, but that’s easy enough to disable using a Save Game Editor (simply set the “food_rate” CHAR STAT to 0).
So all in all it ends up an enjoyable experience with only a handful of occasional annoyances.