I loved how the art, music, and sfx combined to provide a relaxing experience! (The cloud whooshing sound was really fun.) It took a while to figure out how to a play (I have some comments related to that later in my response), but once I did I got the hang of it and had a lot of fun. At first I was frustrated there wasn't more information on the best way to grow the dandelions, but I really enjoyed trying things out and getting a feel for it (once I got past the initial "oh no I keep losing").
Since there are so many elements to the gameplay, I'd love to see some more variety in missions (you could do things with sun energy, water level, dandelion height, etc.).
Related to figuring out how to play. You had description of the different tools, resources, and measures (the cloud, the sun energy, the age, etc.), but I had trouble following. I could read one thing, understand it, and then by the time I got to the next thing forget what I had just read. The problem relates to some things I've learned in a data visualization class: humans have limited working memory, and we're better able to understand things when we don't have to make as many saccades (a saccade is an eye movement that's far enough away it requires you to shift your focus). Also, the way the tutorial/information was shown, the order of the tips is not necessarily in the order the player might want to use those tips (I'd say you generally want to explain things step by step, even if there's not an obvious way to order the steps). It was nice that there was a "don't show again" option, but I found myself wondering "what if I forget? can I never see the tip again?". It looks like only so many tips can be shown at once, and I found it a little distressing trying to decide which ones to close since I couldn't find any way to open tips back up (and yes, I know "close" is different from "don't show again" and I might see again a tip I once decided to close, but it was still mildly anxiety-inducing because I wasn't in control of showing tips). Also, because you gave lots of tips, I think I assumed everything would be given as a tip. It took me embarrassingly long to realize how to zoom out from the dandelion, and even longer to realize I could use my mouse's scroll to see more of the land.
I think this game would really benefit from an improved UI design. You could either have some sort of menu with descriptions next to pictures from the game, or you could have your text bubbles appear close to the things they are talking about. And giving the user the option to show/hide tips would be great. I know that could be rather complicated from a technical perspective, though (my guess is the menu option I talked about would be a simpler solution). The key points are, give the text context (by use of pictures in a menu, by putting the text close to the actual object it's talking about, etc.), and give the user control of showing/hiding the tips. Update: I realized after playing more there is the possibility to restore tips, but I didn't see it at first because I didn't see the menu. The menu button is so small and in a corner so far away from where most of the gameplay takes place that I didn't notice it.
Also, I think I found a debugging key that was left in. Pressing the key sends out dandelion seeds. I first discovered it in the easter egg mission but it didn't register as an easter egg (and the key worked in other levels and in sandbox mode). When I first discovered the key I pressed it a bunch and at some point managed to grow dandelions in the sky! Entertaining, but perhaps not what you were going for.
