Is this Map "Beatable" at all?
Yes, it is. However, it differs from the Common Impossible Maps and also is harder. But still everyone with decent Skill can beat it.
If you think theres a Part of the Map that cannot be beaten, You can leave a Thread about it if you think there's stuff to discuss about or just write it into the Bug Sticky How long did it take to make Abyss?
I cannot tell you the exact Amount of Hours, i started it at the 26th August 2008.
I didn't work all the time on it but i surely spent more Time on it, then it's spent on normal Maps.
If you want a Number, there Currently over 100 .SCX files of Abyss in it's folder.
Are the Sounds really Necessary?
Well nothing is really Necessary. But i think their a good Improvement for this Storybased Map, all not Virtual .WAVs im using have probably 400kb together, that's not too much for a Map like Abyss. If a Player can't wait this time to DL, i still provide the Map on this Website, where you can download and put into your Starcraft folder in a total of 20 Seconds. If thas still too much work for someone, i highly think he's not able to play and Enjoy Impossible Abyss anyway.