Yeah, I wanted to have a more interactive tutorial, but the time was short :D Having the right tutorial in your game is always a tricky thing to achieve, especially for game jams. Just writing it down on one page is not good, because in the next you have forgotten half of it already :D
Yeah, I spend some time for tweaking the levels and making them progressively harder. The machines have some parameters i can tweak. One is the first time they break, this is fixed for every level. so the start is the same. After that i have a min and max time which generates a random time after with the machine breaks. Then I can also decide the percentage of the toys falling right and left and the probability of needing a screw.
Yeah, the I don't know why I chose the mouse as input, but there is not only the left button. The right button is for dashing ;) You could also play with a controller if you like. But there is always one person that prefers one control over the other. Can't satisfy everybody.