The original idea I had come up with was 3 extra bounces per jump and perhaps rebounding off the walls. I decided this was way too hard to control for the player and we compromised on the simpler option of just 1 extra bounce for easier testing. It also made sense to have simpler controls for the small scope of the game.
We often found ourselves playing our game even during idle moments in development and having fun trying to actually get a complete playthrough of the game from start to finish. We playtested this game so often that the double jump just kind of grew on us and we kept it as is, opting to finish the game with the limited time we had instead of implementing additional mechanics.