I don't remember a whole lot of physics puzzle in HL1. Regardless, I think whatever Valve releases and calls 'half-life 3' these days will disappoint those still waiting for it, yet it won't attract all that many new players with the name alone. After all, it's been almost 15 years since the last big game in Half-Life series got released.
At any rate, if you're craving more Half-Life-esque game design, give Titanfall 2 a shot. IIRC Titanfall 3's in the works right now, which is grand. Sadly, the original game did not have a campaign.
Titanfall 2?
That is nothing like HL. Still a great game though.
I'd personally recommend Singularity.