A great factory game implementation. Some small complaints. 1) It's too easy to delete combinators; I accidentally deleted them a lot. 2) Recipes are important to the puzzles, but it takes 2 clicks on different parts of the screen to see them, and there is no way to sort by input or output items. 3) Each level's goal requires a click to see, but it's always the first thing you'd do on a level. 4) Most "do not pollute" goals are easy to satisfy just by putting a trash collector by a burner; this requires zero thought, so it's just annoying when you forget to do it as the last thing. 5) Some electricity puzzles are hard to figure out without prior experience with circuit logic; a tutorial on basic patterns would bridge the difficulty gap. 6) Hints are given in a predetermined order; sometimes I want a specific hint. Still overall, a great game that I've spent hours on.

This is an awesome game, and I love playing through it. The pipe levels are a broken though. You can't complete the last 3 tutorial levels because some levels don't allow you to open the pipe infrastructure tab even though you need it. Then on levels when you can access it, you can't lay pipes at the output of the combinator in order to complete the level. Can you please fix this?