This feels like a mostly well executed small scope game.
Quitting on exit is a bit of a bummer, but sometimes during game jams, it's difficult to prioritise doing a game over screen and/or a menu.
As others have noted, there's probably room for more interesting gameplay with/without shooting.
I also mentioned below that the bundled libraries weren't quite being loaded correctly. It would be good to either make note in your instructions, provide a launcher script, or compile with an appropriate relative rpath.
Otherwise, a nice colourful little experience ^_^