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.