Concept with side-scroll

[dday9]

I'm creating a side scroll game where the user cannot move horizontally, but can move vertically. The idea is that objects will be coming horizontally from right to left and the objective of the game is to avoid getting hit by an object. The part that I want to figure out before I go any further is the difficulty. Should easy have less objects that the user has to avoid and hard have more objects where the objects move down the screen at the same rate of speed? Or should easy have slower moving objects that the user has to avoid and hard have faster moving objects where the amount of objects are the same no matter the difficulty? I could combine the two concepts, but that will mean much more work

[Jacob Roman]

Take a look at my flappy bird game only combine that with a tile engine where some groups of tiles will be collidable. Im thinking of doing that in flappy bird with scrotum guns, spikes, lava pits, and enemies o.O