If you are able to make an HTML5(Web) build of your game you really should do it. It's going to greatly increase the chances of people playing your game. The Unity web player was a bit jank in the past, but lately I haven't noticed any meaningful quality difference between my HTML5 and Windows builds. Seriously, do it.

If you have an HTML5 version, consider putting the HTML5 logo in your thumbnail. It will definitely attract more clicks. Make sure to put the logo near the center so it isn't blocked by the giant Ludum Dare overlays.

There's no shame in wanting more people to play your game, do what you can to make that happen!

Our Game: https://ldjam.com/events/ludum-dare/46/final-flower-petals-of-a-lost-age

Our Thumbnail: