Funny newbie error - renaming Reset by accident :) :)

Oops! :)

You can either:

delete reset;

Or probably the most important way out (mentioned in troubleshooting) is:

Press and release RST, and press BTN1 immediately after.

Not too soon after though (or you'll get the bootloader mode with the glowing LED)...

Once you've done that, Espruino will start up without loading the saved program. You can then just type save() to save a blank program into flash :)