Really hard to give feedback on this, because it's good! But there could be a lot more charm to it...

I think typing text and sound effect for it would make this 50% more better. Some more sound effects of nature would be great too, and also improving terrain collision would be good as well. The objectives position could be more different as well, all of them are literally in the same place over and over...

Other than that this is really well done, good job!