I played the game for almost a half hour and wrote down some of my thoughts while I was playing.
-There's a slightly confusing grammatical error in the tutorial: "With a Frig select click on the Output Tube to send it to the next room." should maybe be "With a Frig selected, click on the Output Tube to send it to the next room." It confused me for a sec, and I thought I had to do some other kind of input that wasn't specified.
-I think there should be an option to skip straight to the next level instead of wait the 10 seconds after finishing a level.
-A hotkey for each machine and for the tubes so you only ever have to click on the frigs once you've got a grasp of the recipes and get a rhythm going. It would be useful for runs where you want to push through the orders as fast as possible (something I was trying to do)
-When I was playing my first couple levels, I was thinking that if I only clicked on one of the machines to pull a frig out, it would stay in position on the machine but still outside of it if I moved to another room. When I realized it didn't, I felt like it would be a cool addition to add to the game to allow the player to hold a frig in front of a machine in addition to the three free spaces they're intended to be held, with the caveat being that if you hold a frig in front of a machine then that machine won't be usable until you can move it. I think a feature like that would be cool for an endless mode run where the times gradually get shorter and shorter and the player has to juggle more and more frigs and recipes at any one given time.
-I think it would be cool if one of the business frigs on the right side of the screen would say a little pun or something whenever fulfil an order correctly, or they get mad and say something snarky when you send a frig down the wrong tube.
-In my opinion, considering the fact that you can only ever have one frig on the first and third window, they should always be selected by default. I like the core game loop, but I think adding in some of those moment to moment conveniences like that would overall help the game a lot.
-I really like the music and sound effects, I think it all fits well together with the game's overall style.
-The frigs are pretty cute, and you've opened my eyes to seriously considering the elemental power of leg.
Overall, I think this game is clever and very well done and has good potential!