The javascript editor is displaying error messages, did something change recently in the newest beta? with the linting?
so the game starts up fine, no console errors, its just the editor reporting back false positives, also the highlighting of the same selected word, also highlights white space which looks a bit weird, will fill bug for this later.
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Looks like the error markers in the text editor aren't being cleared, it isn't normally possible to see more than 1 syntax error because the JS parser we use stops once it hits an error. Opening and closing the text editor should clear any invalid markers. I'll take a look at it.
I've looked at it and it was a simple typo in a recent QOL feature. Fixed for the next beta release.