Hey, thanks for the feedback! The hit flash is something that the next build will have, but about the ship UI... isn't it see-through when projectiles and enemies go through it?
Objects should be entirely visible (although filtered into a different color when going through the health bar (...wait, is it even a bar?)
Could you send me some screenshots or footage on your end? It'd be a real help, especially since recently, there has been some graphical bugs with firefox specifically.