Wouldn't say it's worth full price of 15$, and it's disappointing that somehow the DLC isn't cross platform while the original game is.
In this game you can customize 3 classes of spaceships (fighters, frigates and cruisers) and change their weapons loadouts, armor thickness and shield strength (all about the tradeoffs). It comes with a few (10-ish) single player campaign missions and 3 races each with it's own set of ship hulls.
The learning curve is there but it's not steep, you can get away with skipping the tutorial. What you do in this game is you customize your ships, and on a budget with restricted amounts of pilots you deploy them into pre-determined battlezones, you customize the AI a little and then watch the battle ensue. You cannot manually control or micromanage ships while the battle is on-going, you must decide it all before the battle.
It's a unique but cool take on real time strategy. In space. You can expect to get anywhere between 3-10 hours from it depending on how fast you catch on to techniques for easy victories, and how much time you spend customizing your ships. For me, as soon as I'd unlocked all the modules and finished all the campaign missions, it was over. There wasn't even any lore to get into. I didn't have any interest in online play either.
Overall it was a decent and fun game, but I found it lacking in content (both mission quantity and amount of things to do for honor points. Once you've unlocked everything, there's no reward for winning battles any longer), not quite worth a 15$, but if you catch it on sale, it's worth at least one playthrough :)