Yes, you're totally right, the rolling jump totally does the trick! It's a clear reference to old ninja games like shinobi, it works well! It's just that, yeah, they're rolling pretty fast and for a pretty long time! XD
For the hidden feature, I'll try to find it by myself then! :P
I'm sorry to hear that you struggled with godot collisions... :/ But don't worry, it's far from a game breaking bug, it is a detail. Don't hesitate to contact me on discord, maybe I can try helping you (well, it's to late for the jam, but it can be interesting if you want to keep using godot), even if my skills are very limited... XD
Hope you didn't think I tried to make fun of you (sorry if you do), it was not the case! As I said, your game really reminds me of old ninja games vibes (and I say that as a good way, as I started playing with that kind of games).