I love black and white personally and have done my comics that way for years.
I do think there's a segment out there that prefers color - which is fine! - and I've wondered how much that's held back my comic, too. (I don't currently have an answer to that question, haha.)
I plan to do a color-version in the future but I just can't spare the time or dime to do it, right now.
Personally, I would kinda lean towards IF you can wrangle doing a color version, it probably wouldn't hurt and might even help, but I don't think you outright have to.
Plus, you're doing grayscale - and the pages look clean! - so I wouldn't worry much about it. A color-version in the future would be cool - and a good way to double-dip on the same content! - but getting the thing out there for people to enjoy should be the main focus, right now.
Have a good one! 