Game still runs the classic gameplay code for AI and physics, just translated into Unreal. And it really feels like it, in a good way, but also a bit stiff and dated in others. Seems to be a trend of porting old core game-logic to modern engines and toolsets, like:

* TES IV: Oblivion Remastered
* Metroid Prime Remastered
* Dead Space Remake
* Metal Gear Solid Delta: Snake Eater
* Demon's Souls

etc.

This gen feels like the era of reusing old codebase cores to stay true to the fundamentals, and I think that's great. It makes perfect sense in an industry where hardware is no longer the bottleneck. Time, manpower, and budgets are. But with every new hardware generation, I always hoped developers would use the extra power to push game logic forward through more reactive and persistent worlds, better animation systems, reactive NPC's, physics, collision systems, etc. Instead, most of that extra horsepower seems to have gone into visual fidelity.

That's why I also appreciate what Capcom is doing with its remakes. Rather than simply preserving the original gameplay logic, of games that er still available to play, they're willing to reimagine it and free it from the hardware and design limitations of its time. 

Funny to see BLAM gameplay-logic still being used in the HALO remake