Nice! I've seen this sort of game a few times (e.g. with washing dishes) but this is a good implementation of the idea while adapting it to the theme. Not being able to advance the tutorial text irked me to the point of not realising I could load the machines while paused (I thought that was reserved for only the start of each day), so I struggled for a little while, but completed it comfortably with pausing. It also would've been nice to have a list somewhere of the combinations (as you found them if you still wanted the player to experiment) as that would've helped with planning. But like I said before, nice job! :D
Metagame cog 98/126