I read through the first chapter and skimmed through some of the later pages.
The Good stuff:
I think your art style is very appealing, and I really like your use of colours. As pointed out by one of your readers, you do your lighting really well, especially in dark scenes like the one in the first chapter.
Your writing is also well-paced and at a comfy tempo that I can read it with ease. I also really dig the concept of Geckie's character (can't say too much though, wouldn't want to spoil the rest of the thread)
Criticism:
There aren't any glaring issues, but I would say for a goal in terms of art, try to work on improving perspective. I noticed that a lot of your backgrounds can sometimes be quite straight on. Other times, many of the lines look too parallel that it is a bit uncanny. It's overall not that detrimental to your work, but with some improvement, it can enhance it to whole new levels. When you get the confidence, try to play around with camera angles as well.
Hope you find something useful in my 2 cents.
Now, this one is really old and complete trash, but I don't think it'd hurt too bad to get some feedback on it: https://tapastic.com/series/SHADE
I'm currently working on a one shot to enter on a shonen jump competition, so any feedback that will help is appreciated 