You're right, and the controls should be improved if we want to make this a full game. However, having 3 dimensions is absolutely crucial in a physics based game like this, I think. But don't worry, we have some ideas on how to improve it! :)
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After reading the comments, I agree the game needs a better tutorial. The key is guiding players to understand your design thinking through simple, structured steps before throwing them into the full experience
That said, this was made during a game jam—it’s completely understandable these polish elements weren’t prioritized. Great work regardless, and good luck if you choose to develop this further!