You're blind. Squeak to see.
WASD move · Space squeak · Shift sneak
Drag to move · SQUEAK to see · SNEAK to tiptoe
No grubs banked yet.
Cash out a run to fill your purse, then spend it: if you're caught, every unspent grub is lost. Only what you've bought is kept.
Best is the biggest bank a shrew has ever built. Banked now is what they'd lose if they got caught next round.