Great stuff.
Yea, very good. Maybe enlarge window height?
I think the window size is fine. I'm playing at 1024x768 resolution and I don't have a problem with it. But since all the sprites are shapes you could probably let them scale to the screen size?
The only annoying thing I found was that the real challenge was the unpredictable wind and that the "lookahead" up was so short that you could end up with a blind jump and it would be practically impossible because of the location of the few blocks and direction of the wind. So more linearly increasing difficulty and one should only die because of lack of skill rather than bad luck would be my quick suggestion.
The wind feels OK to me. Once you see the clouds move you should start moving the same direction of the wind and jump through the side of the screen. As long as you follow the wind you can get to any part of the screen with a full bar of SpinglePower (tm). The same with the lookahead, with a full bar you can get to anywhere from anywhere.
Another thought is to increase wind speeds as you go; little wind to start with, powerful gusts towards the end. What do you think?
That should work. Max out the wind speed so that the player can move in only the same direction as the wind. The platform widths could decrease down to where they are constantly 2 blocks wide.
(for example you can't jump from within a block, which means with too high speed you get stuck in them and sucked down to the bottom).
That's how I lose sometimes. I was getting ready to jump from the edge of the platform and I was sucked back and lost the energy for that jump. During that jump I was holding down left or right to jump to the side but as I was sucked back when on the edge, I slipped down the block and because I lost the energy after being sucked down I didn't have enough energy to get far enough to the next platform, this is bad especially when the platform is on the opposite side of the screen.
There's one "bug" I found, you can press the jump key while the game is paused and the jump will be triggered when you unpause.
You could make the night turn to day again and constantly cycle them. A threat would also be nice, say, a bird comes flying across the screen and knock you away or something.
Other than all that, great stuff.