That's enough. If mughal empires can ride horses and fight with enemy wearing steel body armour then there should be no movement problems for cricketers. SO ICC should consider to introduce steel body armour for everybody in cricket field.
I think this helmet would cover the front side of head, ears and neck but yes, we would need a better one to suit cricket as this helmet doesn't cover much of the back i think.
Also some light weight special suit to cover the chest would be helpful.