Art and Animation
Wall texturing, sprite object rendering (animation and rotation), object shadows, enemy death animations, draw distance/fog rendering, scrolling skybox, HUD refinements, snow weather effect optimizations, custom menu cursor, floor and ceiling distance gradient, movement sway animation, level start/end HUD transition
Enemy AI, vision, and pathfinding
Enemies have a 90 degree field of vision within which they can detect the player or another character that has just caused damage. A simple raycast detects whether the target character is behind a wall.
Pathfinding uses a simple breadth-first search, due to the limited size and complexity of the maps. It is only used while enemies are searching for their target. While in that state, enemies can open doors.
Other Gameplay/Engine Programming
Mouse input, interactive doors, color-coded locked doors and keys, projectile/item/character/map collision, garbage collection, level data structure, level stat tracking, level transitions, story introduction and conclusion screens, image loading improvements, assorted bug fixing