Fields overall played really well. That fumble that Denver took for the TD is kind of hard to pin on him, as soon as he turned around, there was a defender in his grill so I'm giving him a pass on that one. The INT was apparently a miscommunication, according to Kmet...and yes, Fields still holds on to the ball way to long, he needs to make decisions quicker.
I pin this loss more on the HC than anyone else, his defense still can't stop anyone when it matters, and that going for it instead of kicking the FG was dumb and even dumber was the play call on 4th down.