From the dev: "1.0, the game IS NOT COMPLETE, This simply means that the game has received its 10th update"
Developers: version numbering goes like this 0.1 ... 0.9, 0.10, 0.11 etc
The dots are just separators, its not like a decimal fraction.
You can count up as much as you need, such as 0.5000 for version 5000.
Also, there is no requirement to hit 0.9 before doing 1.0
Or use three sections (0.10.1) for minor increases like bug fixes.