Thanks for all the feedback, it's great to get this much in one comment! Holding down in the air to maintain momentum is NOT intuitive, but it's something we sadly couldn't fix in time for the two weeks we had for the game jam (which is going to be a running theme for this response.)
More tutorial messages is definitely something we'll note for future reference. It's hard to tell how much is too much with something like this, especially since the player doesn't always want to stop and read everything with a big purple wall behind them. You're right though, we should have had a message for that second platform fall. Sorry for any frustration it caused!
It is possible to escape while holding every coin in the game (I had to do it way too many times before uploading it) so discarding coins was viewed as more of a "choose your own difficulty" kind of mechanic. If you were struggling to make it past a certain screen, you could always just throw away what you had to get through it.
P.S. All spelling errors are the fault of @patrickpatrick, I take no responsibility.
P.P.S. Yeah, the failed double jump seems to happen when the player jumps too close to the edge, so it registers that you jumped while in the air. We're tentatively planning on doing some updates after the game jam's voting period is over since only hotfixes are allowed at this time. One of those changes will probably be adding some "grace period" right after the player runs off the edge, but we'll see.
I've also seen the flashing lines sometimes in recent playthroughs, hopefully we can get a fix for it.
P.P.P.S. We're glad you enjoyed it!
P.P.P.P.S. Weird, not entirely sure why that happens. Might be an itch.io problem, might be an us problem, might be a you problem. Might be all of the above.
Thanks again for the detailed comment, it means a lot to us.