The character is fast and can cover a ton of distance with his jumps, which is great. I love speed and mobility in platformers. However, this does make the first couple of level designs feel kind of claustrophobic to me. The distance between the player and their next objective is way shorter than their movement potential, and you can't jump around too freely due to the narrow gaps between platforms. With this in mind, I really like the design of the third level, which has a big open space, and the player really can utilize the range of their movement. 

Put it this way - the player's full jump height is roughly 80% of the screen height, which means that unless a platform is very near the top of the screen, the player is kind of always holding back when they jump. Also, when the player is anywhere above 20% of the screen height (on any of the paltforms), a full jump will actually take the player off screen. So you're kind of stuffed into the level. Maybe this gives points for thematic relevance? Willy is a young, free spirit in an industrial cage? lol

Sorry, this is a rather long-winded observation. I think the game was good. Just something to think about in terms of designing space.

I like it ! it's a bit challenging ! It's simple but it works well and I find it really fun
just one thing : it's a little punitive when you take the wrong item cause you can't let it go (or maybe I didn't find out how to)

I really liked the idea and how to use the theme of Industrial Revolution child labor.  The gameplay was interested and agree that a few more levels would have been nice, but good overall.

Really interesting idea, I love how hectic it gets ramped up the more you play, this is definitely a game that would benefit from having a few extra levels. I found the music got a little bit repetitive after a while, but the sound effects were really well done. I think the game could have benefitted from a very brief tutorial, but it's a really great concept and a fantastic idea for the jam.