The slider really could have more easy interface, such as using the mouse roller to adjust it, it's a pretty good concept, it could also be good if I can change the direction of the rocket facing only at the start then you can after that, not sure if that would mess up the puzzle though. the slider is just the one problem imo. Great job making this game by the way.
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Thank you for the feedback. The issue with changing the heading of the rocket is yes it makes the puzzles a lot easier as you can simply take any path to the green portal, which would make level design trickier.
Funny you mention the mouse roller, that was the original control for changing size. I decided to change this as the slider allowed for more rapid size changes.