Looks like the chain is ok. If it had snapped it would be bunched up somewhere and you wouldn't be able to crank it over.
My guess is that you lost a bolt. Maybe one of the cam sprocket bolts. Take the plastic cover off the front and have a look. Next I would take the sump off and see what you find in there. Don't go removing the head or buying up parts until you have a good idea what's wrong.
My guess is that you lost a bolt. Maybe one of the cam sprocket bolts. Take the plastic cover off the front and have a look. Next I would take the sump off and see what you find in there. Don't go removing the head or buying up parts until you have a good idea what's wrong.