{insert bad joke here}
But in all seriousness: don't over scope and spend time on polishing. Get people to play test early and often. Also, make sure your itch page looks good (with a good thumbnail as well). Basically, do the opposite of me :P
Something else you should be doing: use "karma" sort to make sure you are rating games where the creator is rating more games than he/she is getting and to leave feedback.
Doing this means that you are rating people who are rating themselves, while also being in need of more rates and leaving feedback also puts your game right in their view (as itch automatically puts a link to your game in your comment). This means that when you leave feedback you are automatically advertising your game to people who rate (because the sort on karma) and as you left feedback there is a higher chance that the guy you left feedback for rates your game in return.