I really love the aesthetic. This easily could look like a future transit map made by Metrolinx/TTC with the style. It honestly looks clean.
but I feel the GO station names; the colour of the names doesn't contrast with the black background. Especially station names on the Lakeshore West and Kitchener Lines. Maybe switch them all to white or try some other colours?
Also Leslie/Oriole has a walking connection, but the connection is not on the map, they're two separate stations on your map.
Dundas West/Bloor is hard to read because of the Milton line, try having the Milton Line stick to the Kitchener/UP lines just until above the text and then split the line.
You misspelt Eglinton as Eglington