Update is a bit late, but here it is.
HLnano Release 15
Release 15:
Timer now starts when you walk through the door
GUI and menu all new and shiny
added controls help in the menu
Fall damage
Headcrabs
Checkpoint system
Can shoot barncles tongue
Level layout and graphics have been changed
Added Start menu
Freeman can wear a santa hat (Toggle hat with Z once collected)
Added Freeze Cannon
Freeze Cannon can destrong metal crates
Added health kits
Bug fixes:
Zombies now don't randomly stop
Fixed health station healing you after death
Fixed ladder death bug
Timer now resets after you die
Fix zombies not dying in lava