I think it would be very cool to have a blue - or any other color of course - variation of the orbs around levels, that give (for example) double jump for 5 seconds maybe, and then they would respawn after some time if you need to use them to get over something. And it would also be nice to have some walls that are colored differently, showing that you can't wall climb on them, and maybe you have to use the double jump power, as suggested, to continue. I personally think that would be awesome.