Absolutely good, and immersive experience. I was scared until I had the key. Nice job dude. Also, I didn't knew Coppercube engine. Seems to be a cool software.
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It mostly depends on how far I want to go with the story and how available I am, because I do have a job and a family to look after. If I decide to make something, I announce it the week after I made up my mind. But, recently I've been working on 3 games at the same time and it's been more than 3 weeks so, there is no short answer to that question. Again, usually I spend 1-2 weeks on the game.