Here is another idea. U c o which has something like camera in front and when it flashes the player must hide behind asteroids to avoid instant death. First the u c o fires his regular attacks, but then he enters fhe background so the player can’t hit him and he uses this camera thingy to flash at the player and that instant kills the player. Asteroids are also falling in diagonal direction but those are in the background, also and player must hide behind them when uco is using his flash attack on player. As soon as boss enters the fighting area again the player must avoid his normal lasers again but he can do damage then, just not when uco is in the background.
I got this idea one day when i replyed to @Sammarald s comment saying that why we don’t just instantly kill the player. Then I said that there should be a boss that does that if the player is spotted by him. @InterAction_studios actually liked my post so maybe it has a chance to appear in game. 
Hope you like it! Ps. Sorry for my terrible english.
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