Hi, is it alright to use a prexisting game template from the Gdevelop store and modify it for the game jam?
As long as the submitted game is significantly different from the original template, yes. 馃憤
We have some basic examples of what is allowed on the jam page, but I also tried to better explain it with this pinned comment on discord: https://discord.com/channels/258623956158906368/630511209778774037/1222146236325...
A warning though, if your game isn't significantly different from the game template you originally started with, your game may be disqualified from the jam.