Thank you everyone! I've been making sure to look into every single suggestion! I knew about the London GTAs, but I had never even heard of Dark Years. I had heard of Hector and Sir You are Being Hunted before, but didn't know they were so British! :P I hadn't heard of Dead But Alive, and now it's on my wishlist!
I remember Wallace and Gromit, and I'm really surprised everything else of Telltales is on both GOG and Steam, but apparently not W&G. I still cannot believe I didn't know about Sherlock Holmes Consulting Detectives.
Again, thank you everyone for your recommendations and suggestions. I am really happy to have found these games! :)