What was that recorded on?
The only example I tried (KingGwin.mp3) is apparently a 128k MP3, but it sounds as if it was recorded at a much lower bit rate. Cheap dictation-style voice recorder in long-play mode?

Also you are popping on plosives - need to get further away and put a pop shield in front of the mic.

Without better quality recording it's impossibe to tell what else might need to be done.

You can do better that that with a Zoom H1, and there can't be a cheaper way of making half-decent recordings.