The look and feel is great - really plays like the original but 100x smoother so nice going there. I also really like how the enemies seem to move relative to you, but they also have a mind of their own which makes them feel authentic.

If i'm nitpicking, the trees spawn in pretty close and it just looks a little bizarre to see all these trees appear out of thin air, but since you've scaled down the speed a little bit it doesn't feel unfair or anything. 

I guess you could increase the initial speed a little bit since it feels really slow in the beginning. The bike sprite doesn’t change to the original idle one after turning right or left, it keeps the right/left turning sprite. The rest of your game feels great! Love how you made the trees denser than the original game but keeping the bike relatively slower, so players would feel a larger sense of accomplishment (at least I would). Enjoyed it!