We just made new builds of DEMO version of our game CyberSentinel including experimental WEBGL version that don't need installing of any Unity plugin and should work on any system.
New demo versions can now be found on our GameJolt page
If you have Mac OS X WEBGL version might not work in browser. This is probably GameJolt server-side problem. WEBGL Demo version from our server should work or you can try using other browser (Firefox or Chrome), or you can download MacOSX specific build from our GameJolt page.
If you like our game then please also consider voting for us on Steam Greenlight.
We are also open for any feedback! Please comment, share and have fun guys!