While I'm sure Time Gate would be a lot more eye-catching with color, Time Gate is also very, very long. It takes me long enough to screentone the damn things, coloring the pages would mean I wouldn't get Reaper done well into my late 20's (and it's only the first book).
Some day I'd like to do a full color comic, but that's when I find the time. For now, I just do a color page every now and then in Time Gate (along with colored chapter covers if I like them enough to color them lol)
However, while screentoning bugs the hell out of me and I hate doing it, it definitely makes my pages look a lot better. Comparison below:
Yes, it takes a lot of time and effort, but it's time and effort that pays off. And if color works for your comic and it allows you to produce the best pages to your readers, then - unless your health is at risk because of it or you need to beat a tough deadline like I am, literally my deadline is death lol - it should be worth the extra time to color. That being said, color can be done in a variety of ways, some that can shorten the process, some that can lengthen it - full on shading and lighting, cell-shading, flat colors only, etc.