This was amazing! Love the twist of having to find the doors in order to progress, really innovative!
One of the best things about the game is how you progressively introduced mechanics to the game so that the player can understand them. It's so much better than simply giving the player a list of rules and things you can do at the start of the level, cause you usually forget them. Here by the point you get to the later levels, you already know everything because you've already used it not because you told us. That's great puzzle design!
Apart from that, I feel like the mechanics themselves were well put together. It's nothing out of the ordinary, with levers and buttons, etc, but you blended them together well and the puzzles feel coherent, not just a bunch of mechanics thrown together.
The art design is super cool! I love it! Don't know if you did them or not, but still, the level layouts were well put together too. The music and SFX also helped!
Overall I had a lot of fun. Not gonna lie, I did find the puzzles a little to easy, so if you decide to go further I'd like to see more challenging ones!!!
Congrats!