Ah, damn :(
I noticed that the loading is pretty long the very first time the game is started, but never had someone where it straight up failed when playtesting.
Could you try letting it run for a few minutes (if you haven't already) to make sure it's not just super slow? ^^'
Really liked your game (see my comment over there), Godot FTW!
This time it loaded a lot faster. Tbh, hard to believe this game was done as part of game jam. It feels like a really solid early access game. Its so polished. Game mechanics are great, visuals are well crafted, the audio is nice and relaxing. You did an incredible job with this game. It feels even better than on screenshots.
Some nitpicks are that I would prefer some more hover effects for better player feedback but thats a thing of preference I guess. Other than that I am amazed how well you put all the visual effects with the floating/rainbow text, effect animations and so on. Great example for Godot capabilities. I wouldn't be surprised if your game appeared on "5 Games Made in Godot To Inspire You" video series by StayAtHomeDev.
P.S. There was a small bug where it was super difficult to get out of the box with ores (Entrance is on the right side). Entrance of 1 block was too tiny and I tried multiple times to get out and couldn't. At the end just when I was about to quit, somehow it "fit" into the hole and I could get out :)