Jam Prototype Kit: Pixel Sprites, HUD and a 48 Hour Scope Cut Guide

Everything you need for day one of a jam: a player and enemies, pickups, projectiles, a HUD and dialogue box, key prompts, and a 48 hour plan with scope cut rules.

Build your game around the placeholders, then replace them with your own art and keep your grid sizes and frame counts.

Colour roles

Every asset follows a simple shape language, so you can read its job at a glance:

• Player = blue, rounded shapes
• Enemy = red, spiky and angular shapes
• Pickup = yellow, small and bright
• Hazard = orange, triangles
• Interactive = green (doors, ladders, checkpoints, springs, exit)
• Neutral = grey

The jam guide (PDF, 3 pages)

• Page 1: a 48 hour jam timeline and a scope cut rule ("if behind at hour X, cut Y").
• Page 2: import settings for Godot, Unity and GameMaker (nearest filter, pixel snap, tile sizes). Menu names can differ between engine versions.
• Page 3: the same plan for 24 hour and 72 hour jams, with scaled cut hours.

What's inside

442 PNG files and 529 files in total.

Tiles (72 PNGs + 2 packed tilesets)

• 36 tiles at 32x32 and the same 36 at 16x16: floor, wall, ceiling, one-way platform, 4 edge pieces, 4 corner pieces, 4 inner corners, spikes (4 directions), ladder, door closed / open / key door, water + water surface, lava + lava surface, ice, crate, breakable block, moving platform, checkpoint, spring, exit.
• Packed tileset_32.png (288x128) and tileset_16.png (144x64), 9 columns x 4 rows, with JSON tile index.
• A sample demo level (960x540) and its ASCII map.

Characters (8 characters, 32 sheets, 160 frames)

• Player, enemy walker, enemy charger, enemy jumper, enemy flyer, enemy shooter, NPC (32x32) and a boss (64x64).
• Each has a 4 frame idle and a 6 frame walk/run strip (the jumper hops, the flyer flies), facing right plus mirrored left.
• Single-row sprite strips with a JSON frame-data file for every sheet, plus every frame as an individual PNG.

Pickups (12 items x 2 sizes)

• Coin, gem, heart, star, key, battery, ammo, potion, shield, speed boost, checkpoint flag, power orb.
• 16x16 and 24x24, static icon PNGs plus 4 frame spin or pulse strips (24 strips), plus all-in-one sheets.

Projectiles and VFX

• 3 bullets, arrow, fireball, orange and blue laser beam segments (tile seamlessly).
• Hit spark (6 frames), explosion (8), dust puff (6), pickup sparkle (6), jump dust (5), death poof (6). 32x32 per frame, as strips and as individual frames (37 frames).

HUD and UI placeholders (55 PNGs)

• Health bar and stamina bar (frame + fill), hearts row (full, half, empty).
• 9-slice panels (dark and light), 9-slice buttons in 4 states (normal, hover, pressed, disabled), toggle on/off, slider, 9-slice dialogue box with name tab and portrait frame.
• Arrow cursor, pause / play / settings icons.
• 8 key prompt tiles (WASD, arrows, space, E, shift, click, ESC, enter) plus 8 single key tiles.
• Score font 0 to 9 as a strip and as single digits. 9-slice margins are in the JSON files.

Backgrounds (3 parallax sets, 960x540)

• Grey/blue, grey/green and grey/purple. Each has sky gradient, clouds, far shapes and near shapes. Horizontally tileable.

Palettes

• 34 colors as .gpl (GIMP, Aseprite, Krita), .hex, and PNG strips (16px and 1px).

Formats

• Plain PNG and JSON, so it loads in any engine that reads PNG sprite sheets.
• PNG with transparency (RGBA), crisp nearest-neighbor pixel edges, 1 to 2 px darker outline.
• Grid sizes: 16, 24, 32 and 64 px, aligned to the grid.
• Sprite pivots (bottom-center for characters, center for pickups) are listed in the character and pickup JSON files only.

License

Personal and commercial use is OK in your games, jam entries and client projects. No resale or redistribution of the raw assets. No attribution required. See LICENSE.txt.

Original work

Drawn procedurally by scripts, pixel by pixel. No AI image generators and no third party art were used. The scripts and listing text were written with AI assistance.

Good for

Game jams of any length, prototypes, level design tests, tutorials, students, and solo devs who want to test mechanics before spending time on art.

Also from tunlor: Greybox Level Kit, Tiled ready tiles, 9 characters and 32 icons. Different art style, not designed to mix.