add a level to the display
data-type for room
draw the room walls
wireframe is a grid
badly draw the exit
draw the player
move player badly
make player abstract
handle holding down a key
refactor world ticking
NPC container stub
be consistent about indenting let..in
draw zombies
exit is dim yellow
flesh out updating NPC position
the zombie follow you and you lose
explain what zombies do
NPCs are stored in a map
detect collisions between NPCs
add pre/post game states