Some of the problems people have had with my game on steam, this is using node webkit export:
Can take a really long time to load. I can't reproduce this on any of my machines or friends machines but I had a fair few comments about it in the steam community hub.
The game window can suddenly disappear for some people yet process is still running in the background. Again never happened in all of my testing.
Game just wouldn't run for a fair few people at the start. One person said he got around this error by "fixed by del d3dx9_43.dll and replacing it with same 64bit" Not had any posts about it just not running since then so maybe people are using his fix.
My game also runs slow for a lot of people but that was me over estimating the average persons PC. Expect a lot of your users to run the game with on board graphics.