Not a Hero is an appropriately arcade-like shooter that never takes itself too seriously, and that approach keeps the game fun and the funny. The longer the game goes on the more the charm starts to wear off however.
There are some new elements of course, but where I expected a build on the previous game's mechanics into a brand new experience instead became the same basic feel in a different scenario. Hotline Miami 2 indeed has the Wrong Number in its title, it should read 1.5.
In Helldivers, you're a member of the eponymous super soldier squadron tasked with protecting Super Earth by spreading the ideals of freedom and democracy vis-a-vis fast-paced, twin-stick shooting action.