Not sure that this is really a glitch with the game, rather than some obscure itch store setting not being toggled, but I purchased the game during a sale earlier this year, and had access to the Sandbox version. I just tried to grab the update but the download page now only shows the basic version? I suspect it's due to the fact that because it was 50% off during the sale, I now count as not having purchased it over the minimum to get the Sandbox. Would appreciate a quick fix!