So, not sure if you updated the tutorial in the browser version, but:
Right after the switch, it is nearly impossible to get past the worm enemy. It is also impossible to go back, as the jump to the previous section is a single tile too tall, which means you cannot try going around the worm.
Also, if the worm eats you, and you press w before going fully down, the screen turns grey, and starts to lag the browser as it draws on more and more memory.