I'm really not sure if people are getting the mechanics of this game.  I've tried hard to communicate them visually, but I'm not sure if people are paying attention at all, so I'm just going to write them out.  If you're interested enough in this game to be reading this right now, I'd really like it if you played the game first and then read this and let me know if your experience matches what I've written.  Feel free to read the instructions on the game's page, which includes basic things like keyboard controls.

Food and Pickups

Bananas 

Bananas ripen and spoil over time.  You get more points for each banana currently in the bunch (you'll see 100x1 - 100x5 when you pick them up).

Turnips 

Turnips aren't worth any points, but they increase your combo multiplier (see below).  

Oranges, Strawberries and Cherries

These are worth points, which are multiplied by your combo multiplier (see below).

Crowns

Makes you invincible and able to destroy the bots, which are worth increasingly large amounts of points

Hearts

These will heal you. and appear whenever you're hurt.

Enemies

All Enemies will hurt you.  You can hit Flap to recover more quickly.

Grub-bots 

Crawl around and eat food.

Ad-bots

Roll around and don't eat food.

Cam-bots

Fly around and chase after you.  They ignore screen-wrapping.

Combo System

When you pick up turnips, your combo multiplier increases (you'll see x2, x3, x4... x10).  This is applied to oranges, strawberries and cherries (you can see them grow in size when your multiplier goes up).

After a while, the fruit will start to shake and then shrink back down, reducing the combo meter back to x1.

Strategies

On each level you can earn up to 3 gems depending on how well you do.  Your strategy on any given level should depend on what kinds of food there are:

Only Oranges

Free-for-all.  Grab them as quickly as possible (in the future, I might distinguish these levels more by calling them "Bonus Rounds" or something).

Bananas

Just wait until all 5 of the bananas fully ripen, then grab them.

Turnips and Strawberries

These are the really interesting ones.  The main thing to remember is that, other than bananas, food will not disappear until one of the grub-bots eats it, so you can take your time.  New food doesn't appear faster if you grab the food faster, and if you grab them too quickly you'll just end up with a lull where no food appears.

You might be tempted to just go for the turnips until there are none left, and then get the fruit, but your multiplier will probably run out before you can get all of them.  Always try to have a turnip somewhere to boost your multiplier when the food starts shaking.  This requires plotting a path through the level that alternates between turnips and fruit.  You should usually be able to get your multiplier up to the maximum of 10, sometimes for much of the level.

The gem goals on these levels (in Full Panic difficulty) are designed so that the 3rd gem can only be attained by using these kinds of strategies.  

That's about it.  Not super complicated.  Again, I would love it if you let me know in the comments if your perception of the game was different from this or not.