Also, Photon, there's no need to go on about the strawberries in this pic; I will change it.
Bear in mind I'm not trying to be a jerk. 
In all sincerity, the game is coming along very nicely. 
I probably should have put a '

' in the last post, don't worry, I never thought you were a jerk.
Well. I reckon it is time to introduce the key mechanic.
PhaseThis mechanic allows you to pass through certain objects when you 'phase'.
For example, say you were in this picture:
THe phase block art is completely prototype-y and does not represent at all what will be in the actual gameand you wanted to get the strawberry, all you would need to do would be to press a certain key and then you could pass through that object to get the strawberry, another tap of the key would turn the wall back solid.
But, there is more, say all the ground around you is blue and there is a blue wall like so:

You would have to jump as you phase so you don't fall through the floor.
However this is when it gets really interesting:

Here you would have to unphase while in the wall to make the outside solid. Thos would allow you to jump on the missing bloack space and get the fruit by phasing again at the top.
Oh... This seems to have turned into a puzzle platformer.