• added health pickups
• added a bullet frequency pickup that lasts 8 seconds
• added wraiths that behave like ghosts, but drop health pickups
• modified the spider's shooting patterns to shoot you in bursts instead of a continuous stream

To add:

• UI timer for the bullet frequency pickup
• endgame boss fight
• opening menu/level select
• protagonist sprite
• levels and level transitions

Optionals:

• cutscene artwork
• alternate sprite animations