It's hard not to be enchanted by Valhalla Hills and its beauty is more than skin deep: there are some relatively complex and robust systems and challenges underneath its charming presentation. Lacking a real story-driven campaign, multiplayer support or even a map editor, however, it falls short in both breadth of content and long-term sustainability. What's there is fun, and DLC is on the horizon, but the package is on the light side.
FortressCraft Evolved has moved from being a "block builder" clone to something unique, especially in Survival Mode, which can be played like a multi-faceted tower defense game. FortressCraft Evolved contains the seeds to nurture creativity and imaginative play, but its first few hours are abysmally confusing and its UI is in dire need of a do-over. Not an especially charming or friendly take on the genre, FortressCraft Evolved has a lot of depth and potential for the dedicated player.
Legacy of the Void is an excellent conclusion to Blizzard's trilogy. While one can get impatient with the familiar mission structure, it's impossible to argue with the excellent faction balance and action. As a genre, real time strategy games have lost a bit of appeal and the StarCraft 2 trilogy doesn't move them into new territory. Let's leave that for the next generation. Right now, there's Legacy of the Void. It's all good.
Thanks to these problems, a visually charming and potentially enjoyable - if thoroughly unoriginal - tower defense game becomes much harder to recommend. Of course, grinding to earn upgrade points is always an option, but the levels aren't that charming. Tower defense games aren't exactly gaming junk food, but their secret is in rapid pace and a steady forward progression. Get that wrong and not much else matters.