Practicing a bit does help. But as a new player with 0 knowledge of the game, i think i would need more time guessing.
From what i experience, you only get the bonus if the shape is formed before landing. That creates some moment where i actually do the gesture but didn't get the bonus because it lands before changing shape
I'm not saying that you should make it easier, but consider being generous with the clock in the first few rounds so that 1st time players can get used to the mechanic.
However, it's a game JAM . The core loop matters to me more than balancing