Out of memory. If you are the developer of this content, try allocating more memory to your WebGL build in the WebGL player settings. Keep getting this error when launching the game. I was able to play this a few weeks ago, but this started appearing.
Suggestion: An option to disable the upgrade pickaxe animation, I had loads of blocks to upgrade my pickaxes, but I had to wait for the animation to finish before upgrading again.
For those who are lost with the Six Six Six and K-code achievements, just a reminding the game does detect what key you press...(Hint hint nudge nudge).
After the update, the game doesn't load on FireFox but on Chrome where Unity and WebGL are not working currently, meaning that I can't play on my save, I must say you need this sorted out...