How to finish Level 29 in Spore Origins

Sooner or later you’ll reach the dreaded “Level 29″ in Spore origins. You are required to finish it by filling up your DNA bar on top of the screen by eating food. The problem is there is no food. There are only three giant monsters that float around passively, surrounded by predators. The tricks is to make the predators attack the giant.
First poke the blue frog-looking fish that swims among the green plants. Do this only when his color turns to blue, otherwise you’ll be poisoned. Do this a couple of times to be sure you gained enough life, then start circling the giant when the predators are around. Whenever you’ll get in front of the predator, he’ll turn to red and charge you. If you happen to be between him and the giant at that time and swim away quickly, he’ll bite the giant instead. You’ll need to get the giant bitten at least three times before he’ll turn into food.
One giant won’t be enough to fill the DNA bar so you’ll have to get two destroyed.
Remember to react quickly and always try to keep your health to at least three or four full red hearts.

How to finish Level 30 in Spore Origins

This is the final level and you have to steal some eggs from a giant jellyfish. The thing is you don’t actually have to charge the jellyfish. Just go to the far-left side of the pond with the two green plants. Eat them three times (waith about 30 seconds for them to recharge). Eat the two squids that swim nearby. You’ll have to eat them twice for the DNA bar to recharge completely so you have to be patient for them to reappear. Just swim around a little bit and watch out for the eel.

What can I eat?

Later in the game you’ll be able to eat those that attack you. You can tell the difference between what can be eaten and what not by the circle that pulsates above them. If you have enough health, the circle will appear on top of larger creatures.