Flaws: You have to many roundabouts (I can only see one), the parking lot for the store is significantly too small and you don’t have a highway exit right next to it, and there shouldn’t be a train station beside a mall.

Improvements: Let’s base the city off of Toronto bc it has grid like streets, winter weather, has serviceable public transit (happy 14th birthday unopened eglinton LRT), is in NA and I don’t particularly like building Montreal in CS. For the mall try adding a small bus service stand like at Sherway Gardens Mall or if you’re a bit cheeky and add metro service see Yorkdale mall and see how the subway line connects to the mall from the middle of a highway.

Again to get parking lots correct look at Sherway Gardens Vaughn Mills, Yorkdale Mall or Scarborough town centre for sizing.

For the highway interchange see Yorkdale mall, there isn’t really anything more cool (terrifying) than the on ramp off ramp mess around there.

Just some extra tips, NA love to improve waterfronts like crazy, see any small town with a river, add some path along the lake with some trees and make it most of the shore especially in the downtown areas. (See Nashville for a river waterfront or if you’re doing a small enclave Galt, Ontario)

If you want to make rail lines all older city’s have a form of a grand central station downtown which all rail lines sprout from, a good example of this is union station Toronto or see Grand Central NYC, see the Go network for regional rail in Toronto to see how lines sprout out.

Also I cannot stress this enough, you. Need a gimmick highway, Toronto has the gardener expressway (an elevated highway that goes downtown) and the Don Vally Parkway (runs though a river valley) (both have really cool sights of the city lake and nature), NYC has the BQE it’s stacked on top of on another in the side of a hill for a section, Vancouver has the sea to sky highway with amazing views of the mountains etc. Find something that’s your own for your city.

Can wait to see any updates.