Do wings make you fly faster in +1 Wings For Eggs?
The wing cards that could be read state a Wing Stamina multiplier, not a speed value, and no source read for this site shows a wing speed multiplier. Speed is bought from the separate attribute card that sits next to the Cash counter.
Should I buy Carry Limit early?
Only when flying the same route twice is what is slowing you down. Carry Limit 1 to 2 cost $500k in the recorded session against $263 for a Speed step and $9k for a Wing Stamina step, so it was the most expensive of the three early options. Its Robux row read 99 in one pass and 80 in the later one, so no single Robux figure is published for it.
Can every wing be bought with Cash instead of Robux?
Every wing price that was readable had a Cash figure and a Robux figure on the same card, and the attribute cards did too, so the Cash route exists for each of them. Where a Robux figure was not legible, the row says so instead of borrowing a number from another source.
What comes after Jungle Wings?
A Skeleton Wings card reads 1.9x Wing Stamina at 280 Robux, and a Cyber wings card reads 2.2x at $100T or 400 Robux. The published wing list also names an Angelic Wings as the top pair without printing a value, and no card between Skeleton and Cyber was legible.