Same side-view runner, now with two portals. Green warp tubes: run into one (don't jump it) and you warp to a different level — a different Background Weaver generation, with its own colours and feel. Jump over it and you stay where you are: that's your route choice. Gold sound item: grab it and the run pauses, a Tap & Tell guessing mini-game replaces the whole run view (nothing to scroll), then drops you straight back into the run with a bonus. The two games are now one game.
Keyboard: Space / ArrowUp = jump (press twice for a double jump), ArrowDown (hold) = duck. Touch: JUMP and DUCK buttons. Tapping the corridor also jumps. Green tube = warp (run into it). Gold mic = Tap & Tell portal (grab it).
Why this answers the background question: each warp world is a different Background Weaver generation — Corridor, Engine Room, Hydroponics Bay, Lattice Void — so the same runner, same code, and different art/effects per world. That is the route to test background generations without rebuilding the game each time. True Habaskin 3/4 bird's-eye still needs 3/4 editions of Background Weaver and Sprite Forge; this v3 stays side-view on purpose.