Thank you for playing. Out of curiosity would you have liked more puzzles of the same difficulty or continually more and more difficult? We considered adding rotation in or puzzles with more pieces but decided to keep things simple.
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I definitely support having more puzzle pieces, and larger puzzle 'templates'. Especially if you're able to come up with some that have multiple solutions. Rotating puzzle pieces is not a requirement in my mind. I think the difficulty was in a good spot for the jam. All though an extra few seconds on each puzzle would be nice, and keep the same game feel.
Just like how the game rewarded your final invention based on the number of puzzles you completed successfully, it would be awesome to further combine inventions you made into a "mega invention" that uses all of the completed puzzle pieces. This could be a more difficult puzzle than the ones that came before.
Hope that is helpful! Once again, awesome entry!