Hey, thats great! I also recently quit my full time job to go full time on game dev. I am working with 3 college friends on an indie game full time. I think you did a phenomenal job, but especially for someone who is trying to get into game dev!
I totally agree with you that making puzzles is hard, that was a bit of an oversight in my feedback :). But I still think you could expand it, not by making harder and more complicated levels along the same approach, but by making the difficulty progression a bit smoother (say 20 or 30 levels rather than 10) and by introducing new mechanics, obstacles, ideas, and enemies in all those levels. In other words, stretch out the game and add more mechanics in between to keep it fresh.
Do you need to expand on it? Definitely not necessary, but it would be awesome to see this game for a few bucks on steam rather than a smallish, simple game for free here on itch.io. It could be a test commercial project for your dream of becoming a full time game dev.
I saw that you played my game, thanks for that! Usually when I work on a game jam game, I aim to make some simple main mechanic(s) and then add new level interactions, obstacles, enemies and ideas as I go through the levels to keep twisting the mechanic and keeping things varied. That is just my way of viewing games and design, and I get that you may have a different view, which is totally cool.