Day 3

Implemented super basic mob physics today. Made some new sprites to test things (the blue one is the player), and decided I like double-sized pixels better than triple.

For some reason I thought Bresenham's algorithm would be a good way to implement velocity slower than 1 pixel per frame, but that was really just an unproductive detour. The player is still super fast, still can't slide against a wall, and the collision "box" is just a cushiony point. Definitely needs more attention.