This was really fun! Interesting idea, and pretty good execution. Now for the feedback: I feel like the countdown goes a bit too fast after a while, to the point where you physically cannot reach the green spot before the timer runs out, which feels a bit bad. Losing is also too hard, since you only lose hp after falling of the edge. And finally, waiting for the timer to run out after taking a point takes a little too long in the beginning.
Good job with this one!