Okay, here are a few comments from playing version 1.4. One of these issues (#6 below) was probably in version 1.3 as well, I just didn't look at the .bic file for that version so I didn't notice it before:
1) I like that you added Giant Spiders for the barbarian unit, very appropriate for the setting. Nice touch. I noticed you gave them Stealth. The Stealth ability only works for aircraft. I believe what you were probably thinking of is Invisibility, which does work with land units. Also, giving them Blitz, Radar and All Terrain Roads is a bit too overpowering. Maybe they should have Blitz and Invisibility or Blitz and All Terrain as Roads, but probably not all four abilities. Also, at first I thought the stats of 20/20/3 were too high, then I remembered you used Modern Armor before and there didn't seem to be too many problems with that, so the stats should be fine.
2) I also like the addition of Giant Squids for for the barbarian sea unit. You've given them the transport ability. Unfortunately, the barbarian AI, from what I've seen, doesn't know how to use sea transport (at least, I've never seen the barbarian transport units by sea).
3) The cost of Future Tech was reduced to 150, normally I think it's 400. Was there any reason for doing this? I think this should probably be left at 400, as I was able to reach Future Tech 10 in no time flat.
4) Perhaps the civs should start with Monarchy instead of Communism. They've got 10,000 starting gold, but can't use it to rush build under Communism. If you wan't to keep Communism, maybe you could reduce the starting gold to something like 500 or 1,000. This isn't really very critical, but all that money is useless with the Communist form of government, especially at the beginning of the game.
5) I saw in the read me that you've given the Laser Satellite the Infinite Bombardment ability. However, I think this only works with nuclear weapons (i.e. ICBM). Have you tried the laser satellite it in your scenario yet, and does it work with Infinite Bombardment?
6) This one is the most important, and I'm surprised I didn't run into this in version 1.3: the new units you've added have unique civilopedia entries (example: PRTO_Giant_Spider). If you're going to do this, then you should also provide the units_32.pcx, PediaIcons.txt and Civilopedia.txt files you are using, along with the appropriate unitslarge.pcx and unitssmall.pcx pictures. Otherwise, the game may crash, especially if you click on the science advisor or the civilopedia, and may cause the game to crash in the city screen.
Note, however, that adding all of this material will significantly increase the download size of your scenario. Also, until PTW is released (with the new mod manager), players would have to manually swap files to play your scenario. This isn't too hard to do, but it may turn people off to your scenario because they'll perceive it's too much trouble to install.
What I like to do when I add new units is to use the civilopedia entries for similar units. For example, for the Laser Tank, I would just use the Modern Armor entry (PRTO_Modern_Armor). It isn't perfect, but it's close enough, it decreases the size of the download and makes things easy for other users. True, if players click on the civilopedia entry for the Laser Tank they'll get the description of the Modern Armor, but IMHO it's a minor consideration. Besides, I rarely read the civilopedia entries for units anyways, but then that's just my playing style.
I've already gone ahead and done this in version 1.4 so I can continue to play it without having to worry about any unexpected crashes, though I haven't changed anything else. If you like, I can PM you a copy of the modified .bic for your review.
All in all I like how things are shaping up. I do miss not being able to get Modern Armor from goody huts, though.

You have an advanced barbarian slot that you aren't using. You may want to consider assigning Modern Armor, or some other unit, to that slot--you've got it, why not use it.
If I come up with more feedback or suggestions, I'll be sure to post them.