As a botanist and a gamer, Reach for the Sun makes me feel both sad and embarassed. It's not a fun game; it's not a good learning tool; and the lessons that it does teach are often wrong. Yet, somehow, this game has won multiple awards, and the fact of those awards really does make me sad. To give this game an award is to suggest that this is the best we can do. That suggestion is disrespectful to science, because science has huge potential for fun (e.g. Kerbal Space Program). It's also disrespectful to gamers, and to our proven ability to create great games.
The most obvious problem is that the gameplay is all about clicking - even in strategy mode, it's all about the clicking.
A much bigger problem is that, as a player, you have very little agency. You can't just grow your plant in whatever way you like. Instead, each plant has a predetermined fully-grown shape, a shape that was fixed by the developers at compile time. When you add new parts to a plant, you're really just unlocking bits of that predetermined shape. This means that the game is much more about memorization than it is about botany or tactics. To be successful, you need to learn the shape of the fully-grown plant, and then figure out the series of choices that will allow you to most quickly unlock all of the parts of your plant.
As a botanist, I teach that plants must adapt themselves to their environment by making choices about how they will grow. If a seed lands in an unfortunate place, it can't simply pick itself up and go somewhere else, but must instead grow where it lies. For example, a bush on a rocky cliff may grow short and squat to protect itself from cold and wind; while a bush in a shady glade may grow tall and slim to try and reach above its neighbors, and grab a bigger share of sunlight. Thus, the idea that each species of plant has a fixed shape (an idea implicitly taught by this game) is false and misleading.
Another big flaw in the game is the lack of differentiation among species. While there are several different species in this game, from a gameplay standpoint, they're pretty much the same. As a gamer, I find this boring. As a botanist, I find it offensive. The joy and beauty in life and biology come from from the huge variety of shapes, colors, and behaviors that are present in nature. To teach otherwise, as this game does, is a terrible lie.
If you're looking for a bit of variety in your procrastination, something to give you a break from Peggle or Candy Crush, then you may find a bit of enjoyment in this game. If you're looking for something with replay value or educational value, you should look elsewhere.