Relaxing and addicting
There's a lot about this game that I like. The graphics, for one, are pleasing to look at. The music, as well, both fits the mood of the game and is something that doesn't get irritating after a while even though it's a loop.
The gameplay was good. The character's movement never lagged and the controls were both manageable and not overly forgiving, which provided a challenge that wasn't too frustrating (i.e. one where, if I fail, it's not the controls' fault). It was good to have a keyboard command for the medals.
Speaking of medals, I like how there were so many of them (related: it was nice to have such a variety of sapling formations to chase after) and that you included the necessity to refrain from using too many power-ups. Whereas a lot of collecting games load you up with so many power-ups that all the challenge is gone, you did it right.
There's also a lot of replay value.
However, I do have some complaints. Although it is good that there aren't always formations filling up the entire screen and although it's good that the game required me to seek out the ones that I needed for the medals instead of having them all right there, I found that some of the formations appeared too scarcely. For example, whereas the Orion pieces were almost always around, I could go several minutes without seeing a single Twister. This became a problem because in order to get the larger storm formations, I had to get either a twister or a tornado (which were even more scarce). To add on to that, they often moved faster than I could move, which isn't inherently bad as it added challenge, but the problem is that when I finally did manage to make a tempest or a hurricane appear, I would only be able to free it half the time. So, I was only able to get maybe a tenth of the hurricane vindicator medal before giving up. This is all mostly pertinent to the medals where you can't use power-ups.
A tiny detail that's not really important (but you still may want to fix) is that the Tempest Vindicator medal just says "powerups" when I assume it's supposed to say "Free x tempests without the use of powerups." Just a small thing.
Also, the last two sapling collection medals (i.e. the two after Venture Capitalist. I'm assuming those are also total collection medals) seem like I would have to play for a ridiculous amount of time to get them. Thus, they seem somewhat unnecessary.
Overall, it was a fun and addicting game. I favorited and racked up several hours of game play.