Create a cohesive sheet of 37 original inventory icons fo...

Create a cohesive sheet of 37 original inventory icons for a 2D industrial survival game. Arrange them in an orderly grid of EIGHT columns and FIVE rows, read left to right. The last three cells of the last row must remain empty and transparent. Row 1: copper ingots, lead ingot, titanium folded plate, rose-pink thorium crystal cluster, stacked graphite slabs, silicon wafer, green plastanium bars, gold surge-alloy block. Row 2: cream phase fabric, rusty scrap metal fragments, ochre sand heap, black coal lump, mint-gray beryllium wedge, dark blue-gray carbide billet, muted purple-gray tungsten cylinder, brick-red oxide mineral. Row 3: ivory superconducting rods with cyan bands, orange dormant biological cell, red-orange explosive compound pile, purple spore pod, orange incendiary cartridge with dark cap, pale blue metaglass panes, blue water droplet, orange molten slag droplet. Row 4: black-brown crude oil droplet, cyan cryofluid droplet with white diamond, teal cyanogen vapor lobes, lavender nitrogen vapor coil, two pale-blue hydrogen bubbles, three dark-blue ozone bubbles, magenta phase crystal shard, silvery gallium bead and puddle. Row 5: pink-red neoplasm organic blob, training short sword with gray blade and brown hilt, teal emergency repair pouch with cream wrench emblem, red signal flare cartridge with cream cap, two short brown timber logs with pale cut ends, then three empty cells. One complete icon centered in each cell with clear gutters; no text or grid lines. Art direction: carefully authored low-resolution pixel sprites with readable volume and material character, designed to work at 32 by 32 pixels. Every edge pixel should look intentional. Use clean connected silhouettes, consistent staircase rhythms on diagonals, and broad coherent highlight and shadow clusters. Avoid random bumps, pinpricks, isolated speckles, tiny notches, mottled texture and broken highlights. Parallel sides and stable end caps on cartridges; a continuous straight blade and clear guard on the sword; deliberate sharp corners and coherent planar facets on crystals. Preserve believable form and slight depth, rather than reducing everything to rigid flat geometric symbols. Use a restrained palette of about three purposeful solid colors per item and upper-left light. Hard opaque pixels against real transparent background, without antialiasing, blur, bloom, gradients or cast shadows. Do not imitate another games artwork.