Hi, that’s a good looking game! I added a sideload and can’t wait to try it out! Congrats on the release!
I’m writing right now because a few friends had a problem with installing the game via the sideload page on Playdate website (we discussed it in the Playdate Squad discord server). It’s especially hard for people who upload the zipped file from mobile devices where archive/unarchive functionality is hard to find or even inaccessible.
To make it easier, you can zip just the FireTeam.pdx folder and post it standalone. I checked that your metadata in pdxinfo is correct and the game it uploads nicely. (You can include the readme inside the pdx, if you want to.)
Also, the USB method of sideloading is mostly intended for developers (most players don’t have SDK installed), so I’d recommend to post a how to about web sideloading.