Hi, The first thing I noticed was the enormous amount of present participles (or gerunds - anyway the '...ing' endings).
A blanket of rain fell to the earth, bouncing off the leaves of banana plants, pouring from the roofs of teakwood houses, forming waterfalls, cascading to the floor below, creating a percussive spatter on the soft soil. The sky had a yellowish glow to it, and the veil of rain made it impossible to see more than fifty metres ahead in any direction. Ai Yon stood motionless: soaked to the skin; rain running down the contours of his face; hair flat across his head. He didn’t mind being so wet; only one thing mattered to him now: revenge!
He stood amidst the banana trees, intently watching the house where his wife and her lover were taking advantage of the rain to make passionate love. His eyes narrowed as he saw the man caressing his wife’s body, searching with his hands. And oh, how she enjoyed it. Ai Yon tightened his grip on the knife in his right hand; stroking the handle with his thumb. Rivulets of water ran down the cold steel blade. His face contorted like some hideous dragon; lines stretched from the corners of his eyes to the edges of his face. He crouched down and slipped through the foliage, wet banana leaves slapping against his skin as he stealthily approached the house.
At the entrance to the house, he hesitated, listening with gritted teeth to their frolicking. With the quietness of a cat, he pounced upon them, lifting the knife high in the air, screaming a blood-curdling cry. The man – quick and agile – somehow responded and jumped out of a nearby window, running for his life. Only the unfortunate wife remained, on the floor, looking up with a terrified expression on her face. He plunged the knife into her navel, all the colour in her face vanished. He pulled out the blood-stained blade, and stabbed her in the chest; she fell back on the floor; noiseless; staring at the ceiling with unseeing eyes. Blood trickled down her porcelain-white skin. Ai Yon knelt beside her; breathing heavily; head hung low; drops of rainwater fell from his hair and mixed with the blood that flowed down her chest, like newly-formed rivers, searching for a channel.
If this is the first chapter and the first sentence of the story, IMO it's too long.
Consider: The rain fell. It poured from the roof of the teakwood house (by making the house singular you are concentrating the attention of the reader on one particular house; also the rain should be described coming off the roof before the banana plant or it would seem the rain was going uphill. In the next sentence you do the same with the rain on the face and then the hair) bouncing ( not a good choice of word - if a waterfall is the end image) and cascaded off the broad leafed banana plants, creating a percussive spatter on the soft soil. (I agree with mx shining, I think that's sufficient on the rain in this paragraph.)
I hope you find this helpful, good luck with it.
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