In your game Grid of Madness, you have a download button for a rar. Does the rar contain an executable? Than I think it's ok. In the settings of your game's page you can mark for which platform the executable is (Windows, Linux, etc.). If you want to make your game playable in the browser, you need to upload a zip folder that contains a working web build as well as an index.html which is the entry point for your game.
Edit: just saw that the rar contains a Unity build for Windows, this should be totally fine. Just label it regarding the target platform. Also a tip: in Game Jams it's often better to aim for web builds. A lot of participants don't want to download anything, even if a build for their platform is available.