I don't think that's necessarily true. Sure installation puts up a higher barrier but you can probably overcome that by making installation easy (app stores etc

I don't think that's necessarily true. Sure installation puts up a higher barrier but you can probably overcome that by making installation easy (app stores etc) and making sure you have plenty of videos & screenshots on your site to make the game look appealing. I have a feeling that people place a higher value on games that they install anyway (I know I do) and may be more likely to replay it if it's in their Steam list or has an icon on their desktop. Whereas flash games are often seen as pretty disposable.