What about some upgrades or power ups? That would be cool

The arrows are hard to see. They should be a little bigger and/or a color that stands out against the background. The speed should slowly increase as the game progresses. Maybe add a jump feature to jump over the barrels.

why are the arrows one pixel width?

There's a glitch where the arrows don't hit you if you go all the way to the top. And barrels don't roll there either. Also would be more smooth if the wall moves faster and the arrows moved slower.

It's rather slow, it feels like a prototype, and it needs more stuff than just an endless running. It's not great now but may have potentional as others said.