No major improvements after the first one other than a new type of puzzle yet it is much less stable. I had 20+ crashes, some of which made me repeat the whole room again. Some graphical issues, some issues with the states of some objects... I hadn't seen a point&click adventure this unstable in a while.
None of these are dealbreakers by themselves. If you liked the tone of the first game, it's a direct continuation of it. I was already on the fence about it so the issues in this one were enough to turn me off. Still finished it, though.