nice weapon,  the music is pretty good

How it should be end ? I can't kill the boss

I thought that the premise was interesting but I could tell you needed a bit more time to flesh things out. The enemies kept getting caught on the geometry and the final boss didn't do any damage. I also don't know if I was doing something wrong because I couldn't kill the final boss at all and was confused at the ending. I love the gun though (very creative and well animated!) and the sound effects aren't bad. Overall not bad for a beginning attempt. I think if you had added something like a hit marker to let the player know when they're doing damage and when they're taking damage, that kind of detail goes a long way in both feel and information.