Don't gobble your food!
No pits to start with
Limit sight to above-horizon
Collisions shouldn't hurt so much
Make critter's (random) color visable.
Eating is a default
Remove food spots after they are eaten
A few graphics tweaks
Add a global clock
Limit critter sounds to one a second
Critters can eat if they overlap food at all (not just center)
Just living burns food
Put more food in the world
Prune view list earlier
Limit searching to neighbor list updated less frequenty
You can only eat from one plant at a time
Base sleep on time remaining
Commandline args for timing
Command line options for food & pit counts
Memoize senses within each tick