Excellent game! And really impressive that you made it all from scratch for the jam!
Just in case you didn’t know, after reading the game’s page: I actually played this game on a web browser using the left analog stick of a gamepad on my left hand and the mouse on my right hand, so a twin-stick shooter should be actually possible to make. Maybe the problem would rely in different controller brands using different axis for the sticks, I don’t know. It’s good that you included keyboard bindings for compatibility anyway.
That’s all, I salute you for making a game this good in such a short amount of time.