I'm a software developer from the UK. I sometimes make games in my free time. My first moderate success was a Boulderdash type game called Gems'n'Rocks, which I released to Intel's AppUp store in 2011. It had several thousand downloads and achieved fairly high ratings.
A couple of years later I released Minefield to the Ubuntu Software Centre, where it rose to the top of the Puzzles category with five 5* reviews. It remained at the top until the software centre was eventually discontinued.
A couple of years ago I developed Pro Office Calculator, which took around 14 months to develop. It's available here at itch.io and from its official website http://proofficecalculator.com.