Origin8 has brought interstellar war to Android with the arrival of the Silver Award-winning Sentinel 4: Dark Star.
If you want straight-up tower defence with a good dose of depth and weird alien worlds then it should be a good fit for you.
In our review of the iOS version of Sentinel 4, we noted that it's an "old fashioned, dauntingly dense tower defence game."
It's a strategy game worth sinking your time into, then, and one that's "positively crammed full of systems to learn and avenues to explore."
Since then, Origin8 has apparently improved the game further. There's extra guidance available for new game features, revamped visuals, and a new tablet interface option.
Origin8 also told us that Android players will contribute to the same Nexus Global Progress system as the iOS players. So it's now a cross-platform effort.
You can purchase Sentinel 4: Dark Star for £1.99 / $2.99 on Google Play [buy] right now. The iOS version is available at the same price on the App Store [buy].