(tl;dr: check the last paragraph)

I’m using a Linux system. That decreases a lot the amount of games that I can actually play from the entries.

Entering “linux” on the search box gives (at least some of) those games that have Linux binaries available. But this leaves out the ones that would be playable in a web browser.

Basically all other web technologies than Unity can work on Linux. A lot of entries have a “Web” link to a version that is potentially playable in a web browser. Not many of those state what technology the web version is actually using – is it Flash, HTML5, Java applet or Unity. (and many entries do state that, well done!)

A plea to those having a web version of your game available: state clearly on the link and/or on the description what technology your game is using.