Looks like you learned a lot making this one. It's interesting to read through game page to see what you did learn. Thanks for that.
Environment looks a little dull to me, you might like tutorials like this one (https://www.youtube.com/watch?v=8kwnCxK8Vc8) it really helped me get going with 3d. :)
It's pretty peaceful rolling around, especially with the music. Physics felt good too. Keep up the good work, look forward to seeing your next one.