That was interesting and fun! The mechanics are quite unpolished, but I didn't find them frustrating.
I'm aware from other comments that the inability to move while grounded is a bug. And yet, it's kind of interesting? It's kind of like when people have to make those careful hops in low gravity. I found myself seeing how long I could maintain momentum before fully hitting the ground and stopping.
Question: I also noticed that I could jump slightly before hitting the ground, maintaining my momentum. Was this also a bug? It's a very interesting movement idea.
I'm not sure what the difficulty was supposed to be, but I found it fairly easy. I didn't even fall all the way into one of those pits of vines. [EDIT]: "Fairly easy" is a bad way to describe it. I did find the game challenging. Some of the jumps were tricky, and I had to react quickly to new obstacles. However, I thought it was a very fair challenge.
The art and music are very atmospheric. I especially like the menu art!
Great work!