Atlas/Zeus/Ares titian are slow and expensive, but can easily annihilate massed armies and bases on their lonesome, and can be built surprisingly early.
The Helios titian is vunrable against orbital defences, but is a rapid transporter that is otherwise hard to destroy and provides it's own air support; and it's movable, unlike ground-based stargates.
Nukes can 2-hit commanders and destroy armies, but are instantly defeated by anti-nukes: however, they can be launched anywhere in the solar system and are comparatively cheap superweapons.
Colony Drop often completely destroys not one but two planets... which also automatically destroys a lot of precious resources and precious build space: to say nothing of the cost of building the engines to move a planetiod. However, without a way to move the commander away it's an instant win and reduces the potential places they can hide commanders, on top of being a no-questions-asked instant destruction of a planet, all defences being damned.
Played straight with the Ragnarok (which can also explode planets, but is slow to build and takes time to charge as well, making it easily destructible) and the Catalyst (requires a metal planet and 5 catalysts to be built, so you probably could have won twice by the time you fire it).
The Steam storefront page advertised that the game would ship with an offline single player mode after it got out of alpha. Fast-forward several months- the game has been officially released and is online-only. As of early September, the host servers are apparently unable to handle player traffic, leading to numerous connection issues and errors. Offline mode eventually came out in October.
That the alpha cost an unprecedented 100 bucks on Steam and the final version launched at 30 has also raised some hackles. It was the amount that unlocked Alpha access on the original Kickstarter, but with none of the physical goodies.
A decent amount of controversy occurred after the early access version of the game was released in retail stores, an act which many viewed as a money grab.
Quite a bit ensued after it was discovered in a beta version of a build that a commander exclusive to kickstarter backers at $50+ and those who had purchased the $200 limited edition version of the game was being retextured and sold for $10 as a charity item. This was only worsened by the Community Manager denying that the model was identical even though users had access to the files, along with locking civil disucssions on the topic and temp banning one of the more vocal forum members on this issue without warning.
Releasing the expansion as a stand-alone game, rather than a free patch, was certainly contentious to say the least. Kickstarter backers got the expansion for free; but some of those paid a lot less than those that bought the game at it's initial high price range.