8dognight, you started with two of the best we have in Free Games Galore.
You may want to try these based on the two games you played:
Broken Sword 2.5
Penumbra Tech Demo (with a small action scene)
The Mystery of Castle Wildenberg
They are not as long as the two you played, but I beleive worth the time you will put in playing them.
There are certainly others that I forgot and that the members can tell us about.