There are a few things I think people should know about submitting based on what I’m seeing.
First, even though the submission process makes it seem like your upload is final, you can still change and upload new versions of your game until the deadline. It’s better to have something up, just in case there’s a problem on itch at the deadline.
Second, please have a web version or a non-Windows build. Most engines will give you the option to export for Web, making it possible for people on Macs or Linux machines to play your game. Having download for Windows as the only option can put off a lot of people.
Third, don’t overlook the importance of having a tutorial or readme. Even if your game seems very self-explanatory, it can help to include instructions in the game.
Fourth, don’t make people install your game. I haven’t seen this issue yet, but don’t package your game in an installer, or at least include a portable version.
Finally, when reporting bugs to makers, try to include a detailed description and, if possible, steps to reproduce. “It breaks when I click the button,” is less useful than, “If I press the ‘restart’ button after losing a fight, the inputs stop working.”
