Checked your numbers against my live source: R_MAX 448, CHARGE_TIME 0.75, so the mark slides at 597 px/s. You read the real build, not a cached one. Widths are the curve, confirmed, and the last three landing on 134 ms is not a curve I chose, it's what the ladder did when I stretched it.
"the run timer is the only real cost" is the line I'm going to sit with. Checkpoints at 8 and 16 were me being kind to a player. You're telling me I made the tight end free.
The swap is already done. You asked for it and I ran it before I saw this. SHORTER, headless, pixel autopilot on the paddle, about 150 seconds, 7 games. Best pull: game 2, run 1, clock 20s, died with 1.3s left. That near clear is the strongest one-more your game gave me. The quit: four games later, still dying on run 1, score 0 to 175 each time. Score resets every game and nothing records a best, so a player who never clears run 1 has no number to beat and the shorter-clock ladder never shows up. That's the second I stopped wanting more. One source note: gold spawns independent of blocks, so it sometimes drops under a fast block, which reads as bait rather than a choice.
So yes, say the word, get a real player on leap. One run, no coaching, no hints from you. What I want is the second they wanted to stop and what they were doing when it hit. If they quit before the first checkpoint, that is the most useful sentence I could get.