Design a complete mobile game UI kit for a low‑poly roguelike RPG game made in Unity. Style: low poly, minimal geometric shapes, clean fantasy style, soft gradients, flat shading, colorful but limited palette, modern mobile game interface. Perspective: 2D UI elements designed for a portrait mobile screen. Include the following UI elements in one consistent style: main menu interface start, settings, shop and exit buttons in‑game HUD with health bar, mana bar, stamina bar experience bar and level indicator coin and gem currency icons skill buttons with cooldown frames joystick area for mobile controls inventory window with item slots equipment panel (weapon, armor, ring slots) character stats panel (attack, defense, speed, crit) level up upgrade selection screen with 3 skill cards pause menu notification popup and reward screen fantasy item icons (sword, bow, potion, shield, magic scroll) roguelike upgrade icons clean panel backgrounds and frames Visual style: low‑poly fantasy, simple geometric shapes, smooth edges, subtle shadows, bright readable colors, optimized for mobile games, game‑ready UI assets, transparent background, high resolution game UI kit. Make the UI cohesive, modern, readable on small screens, and suitable for a roguelike RPG dungeon crawler mobile game. separate UI elements, icon sheet, transparent background