I'm not entirely sure what the aim of creating this game was.
Let me explain;
Nothing is explained. Why do you magically zap on to a boat? Why is the crystal on the boat? Why do you need to retrieve it in the first place from the boat and not on Xen? Why were the Xen creatures already there before the resonance cascade?
All of this is completely unanswered, but this is just the start. [Spoilers]
Once you magically apear upon the boat, seemingly sent by Zeus, you pickup almost all of the weapons available in the game, instantly making it very easy. If that didn't make it easy enough for you, then you're in luck! Right in front of you is a conveniently placed helicopter, complete with a mounted machine gun, meaning all those Xen creatures are dead before you move 10 metres.
Once you finally reach the main cabin, you are greeted by 3 turrets, which are easily avoidable. In fact, there are 100s of better locations for them, which would have proved challenging, however, the creators were obviously not in a creative mood, so decided to place them right in the open, however, they did take the time to ensure even spacing, which was a nice touch.
Next, you are inside, where you'll reach the lift, clamber through the overhead opening, and up the tedious ladder, and eventually reach the control deck, where you're warmly greeted by 3 soldiers, seemingly oblivious to the Xen creatures which have engulfed their ship.
After this, and a few random Xen creatures which magically appear, you find a man. The soldiers also seemed oblivious to him, which is surprising as he was literally next to them. The man is the most socially awkward NPC I've ever encountered, and was a walk suitable for the Ministry of Silly Walks. He opens a security coded box for you, containing a med kit. This was much needed, as the previous 20 were not quite enough. He the proceeds to open the cargo doors, containing a dangerous creature, which is obviously the best idea. On top of this, he automatically knows why you're there. No questions asked.
You then need to BACKTRACK THE WHOLE MAP in order to reach the cargo hold. Of course, it should be a nice brisk walk, after all, you have just defeated all the creatures, right? Wrong. They've respawned, and in seemingly higher numbers. Once you battle your way through the Battle of Somme, you reach the cargo doors. At first, I wasn't sure what to do, as surely if I jump in I'd die? I discovered that jumping in to a gaping dark hole actually heals you, which was a nice surprise.
So, the boss fight. Before anything even begins, you get to endure a lovely cutscene where the boss sucks up the crystals, which once again begs the question, why?
You've spent the whole game (10 minutes) collecting all the weapons in the game, conserving your ammo, well guess what? They're all gone. You can pickup a few off the floor, but ammo is almost non-existent. The boss itself is, well... interesting. It is a down-sized and retextured version of Nihilanth, and completely lacks any form of animation. To me, it resembles a over-stuffed teddy bear, so stiff that it puts viagra to shame.
Once you've finally defeated him, (Cooked grenades seem to work well), that's it. That's literally it. The boss shatters like if I picked up your vase and threw it on the ground. Oh and the crystals? Gone.
The final credits/cutscene shows the crystals in a different location, which I can only assume is suppose to represent Black Mesa. I don't think I can truly express how underwhelming this game is. The idea of Half-Life: Before is brilliant, but this game, is certainly not brilliant.