I just picked this up and I have to say, I'm pretty much disappointed, even at this price.
1.) The layout looks like the entire document was done in Open Office in 20 minutes.
2.) The 5 races are done in 14 lines of text and I'm not sure if these are balanced (The Half-Orc in particular looks overpowered to me).
3.) The 6 classes are done on 1 page. Each class description is pretty much "they work like [basic class from SWCL] but get one or more bonus abilities:..." The only class with a minor drawback is the Acrobat, but this drawback is pretty much gone by 2nd level.
Example: Why would I play a wizard, if a sorcerer is a magic-user who gets a 33% chance to power up spells without any drawbacks? Without any fluff and background info on what a sorcerer is, it seems sorcerers will just be a more powerful version of the magic-user who in turn gets obsolete.
4.) The thief alternate ability is a nice idea, but the chances of success are not the same as in SWCL for the 1-in-6 and 4-in-6 chances. (The rest are fine and close enough to the original, with a minimal bonus for the thief. You should mention that or re-calculate your translation to d20. (I haven't checked the other special abilities.)
Example: A 1-in-6 chance (~17%) is translated as a 16+ save, which is really a 25% chance of success.
5.) The description of the Hound of Tindalos starts in the stat block instead of in a new line which adds to the feeling that this was done in 20 minutes. The Sentient Chimp has a typo as well. And that's just from skimming the monster section.
Apart from that, the monsters have a few nice ideas which I might use.
TL;DR: There are PWYW and free titles out there which are better than this supplement. This is by far not on par with the SWCL book. Not recommended.