Great concept, I like it a lot. It reminds me of one of those on rail shooting segments of a call of duty campaign. I know you didn't make the music yourself but it's still awesome, giving DOOM vibes. Overall well executed and enjoyable. Very good job. A sprite for the player would have been nice but it's a 48 hour game jam so entirely justifiable. The only thing gameplay wise that could've been improved is it would have been nice to have some other type of abilities besides shooting. The shotgun added nice variation though.