Below is an exclusive interview I did with him via Steam!
Q: When did you start developing?
A: About 3 years ago.
Q: That's Impressive! What inspired you to make Estranged Act 1?
A: I really liked the first jetty of the Half Life 2 e3 demo video, so (I) decided to construct a map with a similar atmosphere. I taught myself the tools, and decided what I liked what I created.
Q: Were you the only one working on the project?
A: Until December 2012 I was joined by Christiaan Bakker. More Recently I was joined by some other talented folks, too :)
Q: How long did it take you to make the game?
A: In total, 2 and a half years.
Q: What's your advice to people that are new to developing?
A: I'd say just jump in, decide on something you'd like to make... A common thing people do is wait for the latest tech, or a new pc, etc. Don't do that, just start working now.
Q: Are there any plans for a sequel in the future?
A: We have announced Estranged Act II, but haven't revealed in details about it just yet.