Thanks for checking it out!
If the bird gets close enough to the bottom of the screen, the game will remove them!
We might do levels in an update.
Sorry about the ads, I tried to control them as much as possible, in that they should only fire once you have died, but I am at the mercy of wherever they load from in terms of how promptly they appear. Also on Android I had the ability to preload them and have them appear with a toggle essentially. On Apple, you don't have the ability to preload them you send the request then it appears once it loads, but like I said, I did my best to have them appear on the game over screen.
Thanks again for checking out my game! Your kind words mean a lot!