This game was pretty nice, my score didn't get saved, but ah well.
The graphics are extremely simple, the walls are plain, but I appreciate the different colors of the walls. The ship is semi-decent, but my downfall is that either my ship is big, or the walls are small, because it sometimes just fits, as well as it sometimes felt too long, because I'd hit a wall when I felt like that if I were a little bit shorter, I would've made it.
The lack of music doesn't make me feel like I need to rush, or that I should be on edge, so I would add some fast paced music as that generally fits this kind of genre (though completely up to you). There needs to be sound effects as well, like, if you hit a wall, an alarm should go off to show the player that they're hit but not dead. And upon death, maybe an explosion and the ship explodes would be nice.
The animation is fluid, though always in constant movement, which is sometimes fun, sometimes annoying. I lined up the wall perfectly sometimes, but went careening towards the wall other times, which I understand is the point of the game, which is why I make this suggestion.
Have a power-up that causes the ship to fly straight when held, and you have to collect or pass so many walls without hitting it in order to fill the meter/button. I don't know whether you would be able to add that, or whether you would feel comfortable adding it, but I feel it would help the player, and make them want to aim towards achieving gaining the power-up.
The gameplay isn't original, but it was executed pretty well. I believe that a bit of tweaking could make this a decent game (4/5) but it currently sits at (2.5/5) for me.
Overall, well done.