I did in fact read that you need to click and hold to aim, but if that's what was happening there, then you either need to relocate that to R-click, or refine the duration that it takes for it to start happening as I was quickly tapping the mouse and not holding it at all.
Viewing post in PANDORA: Legion of Two jam comments
Hey mate. You were completely right, there was a bug in the mouse control for triggering shots. It now works really well.
It also lead me to fix it for the enemies.
So they also now rapidly fire when running (I guess that makes it even harder :D).
Anyway I continue tweaking.
I would still love if you could revisit v85 for 10 minutes and give it another chance.
I also fixed some of your other complains (quotes, etc).
And in theory the graphics glitch should be fixed as well.
Let me know