Terra Proxima, an Epic Choose Your Own Adventure Serial by Rommel
Episode 2: The Lines are Drawn
Here it is! See the world through Sentinel's eyes as you fight the Taktat Empire's invasion to a standstill, and realise that this is just the beginning of what is to come...
Includes the epilogue, Terra Proxima: Hostile Contact, which is rather lengthly and non-branching, but I think it provides good closure.
I have not playtested this - I figure it's better to release now and fix it up later.