AccidentalDenz
Lord of Steam
If you're looking for the Half Life experience but prefer to use a controller, you could do a lot worse than picking up Black Mesa. It's a fan-made reimagining of Half Life and includes improved graphics and quality of life improvements (such as controller support) that are much more common in modern games that were not a thing in the 90s.I was considering buying the Half Life only bundle (2.88) but HL1 doesn't have controller support and I don't game with m&k (it's not practical).
With the Steam Summer Sale on, it's available for under 4 quid.