After playing through the entire set of maps I have to say this:
This map set was okay. There were some spills and thrills as I played along. I could see many maps that could have been improved, some on a large scale. Having only one color certainly made my experience more interesting. Sadly, most of the color I saw was grey, and even though there were different shades it somehow doesn't appeal much. Also, brown just doesn't work for some maps as it really is a bad texture overall. Some maps like MAP13 (with brown and grey) seem to break the monochrome flow, and not in a good way. Combat throughout wasn't hard though. As far as good maps, MAP05, 14, 15, 17, 18, and 21 were clearly the best. 22 could have been an amazing level had it not been for a dumb switch hunt. Many maps were broken in a way, like MAP20 and MAP23, hopefully there are fixes now. All in all, it was rather enjoyable playing the set and was quite enjoyable.
And now, I feel like giving an apology as some of my reviews in the Megawad club may have been a little too harsh. I didn't realize how fun Jaws in Space's maps were until I played them after giving my review. Aesthetically, they are a weak point, but I think that a casual play through the levels that JIS has made is very fun. The reason I was sour was because I'm a completionist when it comes to playing, and I got lost trying to find things. I later realized that if I ignore trying to get 100% the levels can be quite fun. I felt like my reviews for some of Jaws's maps, like MAP16 and MAP19, didn't do any good justice. Overall, I quite enjoyed Jaws's maps now.