Great to hear that you are committed to learning and improving the game!
I know it's hard to design good puzzles, especially in a short amount of time. Understanding how a player will approach a level, providing enough options in a level so they don't just stumble into the solution, but also not overwhelming them, while knowing the solution yourself, is really difficult. I think playtesting (by other people, not just yourself) is also even more important than with other genres.
By the way, we made something similar but not (intended) as a puzzle game. We would also love some more feedback, so feel free to check it out :)