It took me 20 months to develop it in my spare time. I used Unity game engine, I did not have any game dev experience before.
It was more complex that I thought at the begining, I spent lots of time on promotion, marketing, founding company, learning about the legal aspects of different parts, for example music.
Some parts were easier than I expected. Unity makes it very easy to build for all three operating systems (Win, MacOs, Linux), I am not sure why more game devs are not using this possibility.
I also like working on Steam as distribution system. It is not exactly easy for a newcomer, but once you know your way around it has many nice features and it is easy to upload your builds.
Let's see how well this game does, I am excited to either improving it or jumping to a new gamedev project :)