According to the game scenario, you need to find a key, but to reach it, you must overcome a dangerous path and may lose several lives along the way.
- ninja - https://dar7hvad3r.itch.io/ninja-character-sprite-sheet-2d?download
- background, basic tiles - https://craftpix.net/freebies/free-green-zone-tileset-pixel-art/
- tiles like heart, key, box - https://craftpix.net/freebies/free-medieval-ruins-cartoon-2d-tileset/