This was super hard! It seems like the main skill required here is reaction time, and there just wasn't enough time for me to block the arrows as they arrived. Not necessarily a bad thing - I'm pretty slow on the draw, so this might be perfectly tuned for a fast-twitch player.
The art assets looked good - in particular the horse's walk cycle was impressive. The parallax scroll in the background didn't totally work for me, and some of UI in particular feels a little out-of-place - but not a dealbreaker!
The music was cool, but didn't necessarily fit the mood of the game.