Yes, 20 levels is not so much. But I decided that it's better to have 20 levels which are interesting enough than to have 40 levels half of which will be boring. BTW, you can play Let It Glow 1 if you want more levels :)
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This is one of the better puzzlers. Although we have seen many similar, this game has it all.
Chill music, and decent design. The puzzles are challenging enough, if too easy go for speed and ranking. It was fun puzzling. 4/5, thanks courageAE
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Still can't get why the bulb needs to be energized when the sun shines brightly. It's even there on the screen to mock you. But still, gameplay over graphics. 5/5