Hey, thanks for the feedback and for playing! Yeah, I made everything myself.
The double jump doesn't feel intuitive because it works completely differently from the normal double jump mechanic you may find in other games. As explained on the game's page, "The faster you follow the first jump with another jump, the bigger of a boost in momentum you get; there is a linear decrease in the momentum boost reward you get over time.". I made it this way because after first implementing the usual double jump mechanic, I found that it didn't fit the gameplay style. In other games, you use that double jump mechanic because your movements are more precise and separate. In POLYSPACE you run continously, so this double jump method is a bit more in line with the entire gameplay.
As for the portal, indeed collecting the last orb spawns the portal on top of you, which makes have to jump to teleport, but the teleport location is right on top of another platform in the next level, making you land a safe fall every time without pressing anything. But the optimal strategy for a good time makes you collect the middle one within the first ones.
People seem to have a pretty easy time remembering the location of each platform, even on the second level. At the end of the day, both levels are not 100% symmetrical.