It's difficult for me. I'd LOVE to re-implement the things I had to take out. Originally, the level changed in stages according to the machines you built, but it increased the size of my game to over itch.io's limit of 1GB. So a post-update for me would involve optimizing the game as much as I can to take down the size, and clearing out the minor bugs that have appeared in the game. There seemed to be a bug where two UI texts were able to overlap each other, and you can apparently keep building machines forever even though they are already built.
The latter isn't game-breaking, it just means the player might accidentally sink their scrap metal into a machine they already built :P