Game Summary: Not a replay of high skill, many mistakes were made. At the beginning blue had big enough advantage to end the game in my opinion, but this was not what happened. Instead, the favor started to change in advantage of green, who would have been able to push through with obsidians, even a simple radar coverage would have revealed this! But as he has no intel, no decisive actions are taken until later in the game. There are many things that you both need to improve, I suggest you check some pro replays with rating around 5 to 7, these demonstrate a gameplay of good skill level.
smoosh
A decent beginning, I just wish you had sent a few scouts more, it isn't a bad idea to include a scout in your factory queue, just to have one always with you. You sent lots of your mantis against his three pd's, while you managed to destroy one, you lost every single mantis you sent to attack that position, while the other flank was completely open. You could have gone for his base, but you choose to attack the choke, that ultimately won you nothing! When you teched to t2, a few engineers might have been good idea to boost your economy.
Mantorok
You grabbed the islands early. Reclaimed the mantis wrecks around the chokepoint was good. Your build order needs a bit of work, check a replay with some top players and see how they pull out their early game buildings. You didn't scout, he did! He had an early warning at the beginning while he run the mole through your flares there. Do not bother building flares after the few first ones, they have no chance whatsoever against mantis, while auroras excel vs cybran on maps like finn's, with a lot water to do sneak attacks through. It is also generally good idea to hide some scouts around his base, in the water where he can't attack them. He also had a quite big advantage over you, as he had three factories pumping out units to send at you, while you only had one and were upgrading the other. Upgrading factory this early isn't a good idea while playing maps as small as this one. You had absolutely no intel! Build scouts, radar, anything to get that intel of what he is doing etc!