Recommended shoot 'em up on Steam.

[Old Geezer]

Folks, can someone recommend a shoot 'em up that is relatively simple, unlimited lives, with speed and dexterity not being neccessary to progress? The last time I played one was Doom, in the 1980's, but I was a lot younger then, my name should give you a clue. Thanks.
Edit: I do have an Xbox controller.

 

[Old Geezer]

Thanks, and here's me thinking FPS meant frames per second

 

[Old Geezer]

Thank you Gents, now to go shopping