I always appreciate feedback thanks!
1. I'm not sure what you mean by "coloured traffic lights arrows"? Do you mean you can't tell if the traffic light is green or red when cars are under the traffic light?
If so, I'll try to come up with something to make it more obvious.
2. Good point, I'll try to add an option to minimise the final report window soon.
3. I'll be redoing the map save system soon, I'll try to include scores where appropriate.
4. Coming very soon in the Steam version! (either in the first steam release or the first steam update depending on how quickly I can work)
5. Regarding the traffic light weirdness: That's an extremely strange circumstance that I haven't heard of/seen before. I'll look into it and try to fix it asap. Thank you for the report.
In regards to the general crashiness of the cars I am very conflicted at the moment. For me, I find it very odd that people are requesting the cars should be more crashy as it's the opposite of what I expected. I'm kind've stuck between what I think should be done to make the game more fun and what players are telling me.