Shotgun Legend appeared in an article on Rock Paper Shotgun in January as one of the best five unsung games on Steam that week.
https://www.rockpapershotgun.com/2018/01/19/best-new-steam-games-this-week/
I discovered it listed as the 25th best game released on Steam in 2018 on a website called Steam Top 250.
http://steam250.com/2018
There was a review on Brash Games that was later moved to another site called Bonus Stage.
https://www.bonusstage.co.uk/2017/06/25/shotgun-legend-review/
Well before launch it appeared on Scythe Plays on Youtube, among many others.
https://www.youtube.com/watch?v=pQ9l7Z7UxFM