It needs some music or sound efects.
The instructions and more games buttons on the intro screen don't do anything. From the game's description's mention of a twist, I was expecting some difference in rules to standard Spider Solitaire- apparently I was expecting too much: Spider Solitaire Dot WS is identical to the MS version.
The cards don't show number of pips or the traditional pictures for the face cards. This laziness turns rapid identification of cards into somewhat of a chore; in a timed game no less.
All that said, simply as an excercise in programming the game is perfectly competent to a certain level.
Please don't be discouraged by my criticisms, Aidan. Taking a quick look at your other Newgrounds efforts, they're pretty much glitch-free and clean looking.
Props for implementing a redo button.
Minus half a star for the broken buttons, minus half a star for the lack of pips/face card pictures. Four stars.
omegerd solitures i love this game 4.5 for nostalgic feel