If you are talking about big metroid - he is killable. You need to hit it with some big object (If you jump as heigh as you can you will see the rocks on the walls - you need to fire in it
it will fall and hit the boss - you need to hit him 2 times with them to win - 1 for start battle 2 for win).
Stand mode is snipe - use Q key for it.
Game was not finished unfortunatly i just have not time for it. I am not good in animation - so it is not big problem to code the game but i do not like animations i made so i stoped the project
I think i will not try to make big games that needs animations alone animore
- i am really bad in animation so what is the point
if i do not like result
The last boss is Ridley if i remember wright. But last levels looks a little the same becouse i have not got good idea how it is better to create
So sorry