The art style, as many have already noted, is top notch! ... as is the music.
The dialog is also really funny. Do I understand that I'm playing a dog, piloting a ship, because the "ace pilot" doesn't know how to pilot? :D
The fact that the player's own bullets are dangerous is cool and I didn't understand that at first.
The death seems a little buggy, because it takes about a second before the ship sprite vanishes, just leaving the engine exhaust and silence. I hit an enemy ship and managed to travel halfway to the other end of the screen before the ship vanished and I respawned. This made it difficult to understand what it is that I died to. I think @lancejz had the same problem, their comment seems familiar.
The space bar is the button to shoot and it is also the button to advance dialog. This means that if you, like me, spam the shoot button, you will lose out on some dialog when you don't expect it. Different buttons for both would be better, methinks.
Lastly, this is personal preference, but I would have liked the ship to move faster and the pop-gun shots to be a bit larger (or have hit boxes that are a little bigger) but I guess that's just me being sucky ad shmups.
Good game! :)