Fixed screen, at first green light on charge, now not booting and overheating charge

Hi today i got my nexus 6 back, after a smashed screen, i put it on charge and at first i had the green light in the speaker grill, then after a few minutes that light went out and nothing much happened when i tried to turn it on, i left it to charge for a while and when i went to check on the phone, it was getting quite hot (probably as hot as it would on heavy gaming).

Basically i don't know the issue here, im hoping it is a minor thing as at first something did happen, then the overheating with nothing happening. Do you reckon this is done for, or it is saveable?

Thanks