Okay, here is my full(er) review after having gotten the ending, Spoilers obviously so if you aren't the developer please just play the game, it is pretty great.
So first off, phenomenal music. I loved it, the boss music was especially noteworthy, it really made the battle feel more tense. Overall really good music.
As to the story, I thought that was also well executed. Being able to just bypass the "intended" story path is always nice, and the descriptions of situations worked really well. Having the gun in and out of the story was really cool and stuff like shooting the trees was a really nice touch. Having the option to shoot the baby dragon at the end unsettled me a bit, made me think about the actions I had taken in the game thus far, really good. So yeah, wish there were more games like this.
As for actually shooting the gun, that was good. Nice particles and everything, I had a bit of lag but I think that is just my computer. I still think the text went a bit slowly, but that didn't impede my progress that much, but yeah, that is pretty much my only complaint.
Finally, the boss battle. Great atmosphere with the music and lights and such. Having to shoot the shoot button was satisfying, and also being able to beat the fight without the sword was great. You really had to move around a lot, and it felt great.
Final thoughts, amazing. Definitely one of the best game jam games I have ever played, almost no bugs. It was all good. I will now leave my rating.