How are you doing the side-loading? I've only used the SDK/simulator to side-load, maybe there are other steps I need to do for people to side-load via the web/Playdate account? Either way, I'll make a note in "Install instructions" for now!
Ok! I figured it out, I was able to package the game up correctly such that it can be side-loaded via the web/Playdate account! Thank you so much for pointing this out, it's my first Playdate game so I hadn't figured that part out yet.