They attack same as the normal invaders but its just 1.5x toughter, 1.25x attack rate, 1.25x bullet speed, and they could ram directly to you.
(Lets say when you are on right and the retro on the left) the classic retro, they also ram but they are just ram it straight forward. but for enraged retro they are same but they could stir their ram a bit to you
also it would appear on a 100% difficulty
retro
This will fire a lasers (Just like shoot and scoot wave but its straigh forward, not wide laser).
But the different is, it would appear on 70% difficulty (Normal plug). Ofcourse there would be a warning sigh before the laser launch and the will dissapear after 2 second and the attack rate was 0,8x than the normal retro invader. the health was same as other invaders
As for the Enraged retro (When its added). It appear on 100% (Or maybe 110%) the attack rates are 1,2x than the normal invaders. It has an ability to Dodge (Slightly) from your weapon. its health are 1,5x tougher than the normal invaders. and its lasers will be dissapear after 2,5 second.
To sum up, Rage Retro are just elite versions of regular Retro. The greater the difficulty, the more enemies of Rage Retro. (Or maybe make a new wave of “Rage Retro” where only they will be)
retro 
description by @B256, 
artwork by @Darth_Skembesion and @Star_Light
