i managed to get outside the map somehow and now im stuck lo
Same. For anyone reading this and looking for a solution: apparently you can reload the page, and you will keep the upgrades and discovered ores, but the map will be generated again, and you will spawn in the center. You will need to mine your way through again, but it should be easier now with the upgrades.
P.S. I did it only once and I cannot guarantee that the progress will be saved for sure.