The sprites look really great! I especially liked the bullet sprite and particles, I know they weren't the same as the death chase ones but they looked super nice!

I think my biggest critique would be the movement - it's alot slower than in the original, and there were times where the other bikers would exit my range and it'd take a super long time to aim at them again. It also felt a little weird that turning would just have the biker slide to the side then actually turn. 

The rest looks great though! it's a really well done duplicate :D

++++++Very faithful clone of the original game from its visual, driving, UI, Etc. 

Couple Advice:

1. Nice attempt to suddenly change the scale of the tree sprite to simulate the low frame in the original game. However, since everything else is running very smoothly in the game, only having the tree sprite scale does not simulate the low frame rate effect very successfully. (consider lower the unity system frame rate)
2. The tree sprite feels way too big when the player is close to it. I hit trees couple times because a thin tree trunk suddenly turned into a very thick tree trunk.
3. The bullet shoots out feels too three-dimensional compares to everything else in the scene.

Good Job!