GWYN PAUL WILLIAMS seems to fancy himself as a bit of a Rod Setting for the `90s, to judge by the "Twilight Zone` quality of the I I short stories (and two poems, the less said about which the better) collected in Time Puddles (Gilt-Edged Dream Company, 198 pages, $12.00 paper). At its best Serling`s television series was eerie and provocative; at its worst it was pretentious, predictable, and preachy. Likewise Time Puddles, which is unfortunately more often at its worst than its best. In the opening story a man who has led a very dull, orderly life suffers a heart attack and decides to find some new means of relaxation, taking up tuba playing, carpentry, and photography among other hobbies before devoting himself fully to creating a "Cardiac Arrest Resort" In the end his wife kills him so she can get things "back to normal" That is all there is to it. I don`t feel guilty about divulging the ending of this story because all of Williams`s stories come with "surprise endings" that are either completely predictable or complete non sequiturs. If you don`t like the sound of the ending of the first story, stay away from this book; if you do, don`t worry, you still have 10 more just like it.