This was really cool! A great take on the cliche, great puzzles that get harder as you go along - the only problem I ran into was on the level with the moving platform, the platform got stuck and there didn't seem to be a way to fix it.
Level 5 - I played again and it might just be me not being able to figure it out - I realized playing again that the sun powers the moving platform but when the sunlight gets in this position there doesn't seem to be a way of jumping onto the platform.
Ah yes, you might have to restart in this situation, although from the second step you might be able to get back on the platform to finish it. Thanks again for giving it a go!