Help cat agent RB51 navigate through caves filled with natto and collect cat snacks. (Natto is fermented beans, a Japanese food.) Each cave has a required number of cat snacks to retrieve before the exit elevator can be activated. Dangers include falling dried plums and walking, exploding custards.

Furthermore, some cat snacks have been force-fed to cave rabbits, who will detonate at the slightest touch! And keep an eye out for expanding green peas, which can quickly fill a cave or block the exit...

Controls:

Natto-Cat supports most USB joystick/keypads. You may also use the keyboard.
Use the joystick or arrow keys to move, and Fire or CTRL to push/grab without moving.
ESC commits suicide if you're trapped.

Tips:

Falling cat snacks are just as heavy and dangerous as falling dried plums. Be careful when running back and forth at the bottom of a pile of cat snacks.
Custards always circle walls clockwise. Rabbits always circle walls counter-clockwise.
If expanding green peas overtake too much of a cave, they change into plums. If they can't expand any further, they change into cat snacks. (As green peas do.)
RB51 can push a single dried plum, but it sometimes takes a few tries before he's successful.
It is often convenient to use Fire or CTRL to grab cat snacks as they fall past.