Nice! IMO, it ought to be significantly harder. I was able to survive for 45 seconds on my first try--that's long enough that I started getting bored, and I don't really want to try again because it would take at least 45 seconds to beat my previous score. By comparison, consider how long a typical Flappy Bird game lasts, particularly on your first try--probably less than 10 seconds at most! That makes you want to tr…
Depends. There must be some sweet spot there, since if it lasts too little, then it becomes frustrating to retry every few seconds.
Absolutely, and therein lies the essence of game design, right?
For a simple game like this, I'd say 8-10 seconds is a good time to shoot for, for the player's first session. It'll naturally get longer as the player gets better. This makes every moment exciting--just a few seconds longer and I can beat my last score. But yes, this is an art not a science.