Thanks for the feedback!
I believe that with SFX you are referring to the start screen. If that is the case, we take gladly the input; fair point. The intention behind it was to create a tutorial without any text but we clearly didn't deliver it correctly.
The aiming icon turns red when it reaches mouse position, indicating that now the player is able to shoot, so theoretically should not be linked to the interaction with any object. But good point to write in the list for improvements.
I hope you still enjoyed some parts of the game :)