Registered as an autoload so every scene gets it for free. Top-right shows a row of buttons generated from the levels array (main, level2, level3) plus keyboard shortcuts 1/2/3, and it runs with PROCESS_MODE_ALWAYS at layer 30 so it still works while the tree is paused on a death or level-clear screen. Hidden in exported release builds, same rule as the debug flight.
Player: move/jump (Space), test flight (F, debug builds only). Key: pickup, hold S to aim with live trajectory preview, release to throw, W to warp to the thrown key. Spring bounce. Spikes deal damage. 3-heart health, Z consumes a heal item for +1 heart and a 5s shield. HUD with hearts and item count. Death screen with fade-to-black and restart. Hidden passages. Assets: Kenney Pixel Platformer (CC0).
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