Good on you for seeking feedback like this! Here are some things I'd advise looking at:
The lack of clean panel borders isn't really working. I can see what you're going for is a sort of soft fade out look, which works in some comics, but it's not meshing well with your style because you use hard brushes, strong colours and crisp cel shade. If you're really really keen to make this work, I'd advise spacing the panels more, and considering using a bit of texture at the edges to break up that "round default digital brush" look it has going on, but I'd personally advise instead just using some clean straight gutters with a nice black stroke on them to match the black line art of your comic.
The text size is very small. I'm squinting reading it on my laptop, and can't even imagine reading on a phone. The text needs to be bigger. There's lots of space in your panels to make that work. I'd also advise a more comic-like font rather than a typewriter looking one.
The drawing isn't bad, but the inking looks very rushed. It looks like the line smoothing is turned up very high and you're sort of quickly hacking your lines in short bursts rather than slowing down to do purposeful continuous lines. The gappy look makes characters and objects lack solidity and volume, especially when the inking either side of a gap doesn't quite line up, or the line on a bodypart is floppy and doesn't really describe the contours of the body in a solid way. I'd recommend taking your time a bit more with your inks. I know inking sometimes feels like an annoying and boring part of the process of making a comic, but good inking can really add a lot of dynamism and solidity to a comic.
The backgrounds... you know what I'm going to say, right? I'm sure you already know that your backgrounds are too sparse. Obviously making a comic will always be about balancing time and result. You put more effort in, you get more interest out... but if you put too much effort in, it's diminishing returns. Remember, it's okay to use aids to help you to save time, like 3D models either auto-lined or traced over, copy-pasting backgrounds you already drew, using photo references etc. and you still don't need a full background in every panel, but you need enough that it doesn't feel like in the majority of panels your characters are floating in a flat-coloured void.
Keep at it! Your work is pretty well drawn and has potential, so I hope these pointers help.