I took some of my older art, put it together, and spruced it up a bit. (The old art is found here, and you can reference it so you can call the characters something other than "The Green One" and "The Red One": https://scratch.mit.edu/projects/989557039/) Honestly, I like my style, but I do want to see what someone has to say about it. I don't have many problematic points (in my opinion) that aren't just a part of the style (like a lack of shadows), so I wanna see how much you can tear into it and I can see how much I can use it to improve.
You say in the extra section that you also wanna get better at art so here's a tip I learned recently about how to spruce up Vector Art: If you make outlines like me, you might know that the paint bucket tool can sometimes leave a VEERRRRYY small yet sometimes noticeable gap between the inside and the outline. A fix for this is moving the outline in front of the inside, putting an outline on the inside part, and coloring the inside's outline the same as the inside's color. Also, another thing about vector art: Reshape is a fantastic tool to help round out edges or even add edges if needed.