We are still looking for the right balance between ship size and track width. It has a huge impact on the corners visibility and the overall sense of speed. Definitely something we have to work on!
There will be tons of new tracks when players will be able to upload and share their own tracks directly in the game! Stay tuned...
Regarding new track themes and game modes, this is also on our todo list but will have to wait a bit more since we are just a team of 2 for now.
Anyway, thanks for the great feedback!