Awesome game! It's incredible that this is your first jam. I really liked the core mechanic — the way the character can climb reminded me of a game called Transformice. The difficulty feels just right, but you could consider delaying the dash a bit more, as it currently makes the game feel easier. Or maybe make the crystals reset the dash too.
The only issue I had was with the stone platforms that fall after a while — I couldn't walk forward, as it seemed like the platforms weren't properly aligned, really reminded me of Hellstuck. Good game.