It renders levels pretty well, and even loads most of the custom maps I've thrown at it.
INF seems pretty feature complete, though it doesn't always handle starting offsets correctly in custom missions. Enemies have no logic yet, and the physics are flat out wrong. Thermal detonators have no throw limit, so you can yeet them into infinity. The level editor looks nice and can load / display components and level geometry.
For a pre-alpha, it's really far a long and benefits from LuciuXL's previous work on the XL engine. Most of the remaining work is reverse engineering the physics and logic.
Taton Qek, The master of masterfully inspired levels that never get released.