At first, I thought this game is really hard because the bird can't hit the ground but as it turns out after a few playthroughs, it can walk on the ground without consequences. Although, I noticed there are a bunch of coins that are placed below the ground or on the obstacle that are uncollectable.
Nonetheless, my score was a 53 after a couple more playthroughs after I hit the top of the obstacles that was almost as tall as the game screen. I also realized that you can move freely left/right.
It's great to see a replicated flappy bird game.