Sarah's App Cap from iPad Today 198 is a game called dEXTRIS by Chaotic Box. This is an addictive and frustrating game in the same way that Flappy Bird was. The objective of dEXTRIS is to keep the little boxes from hitting the spikes.
There are a few options for dodging the spikes. You can scrape along the sides, hover through the middle, or split the boxes into two to avoid obstacles. The game is free in the app store, so if you like these very simple and difficult games, it's worth a download.
To see Sarah Lane demonstrate dEXTRIS, check out iPad Today episode 198.