Thank you for your comment !
also thank you for your idea of the single button for each layer, we might try it ! although it was part of our idea to only have one button to switch from a layer to an other to create a new challenge. We're probably going to test several options for this layer switching thingy.
We've already talked aout polishing all of the visual aspect and the UI. We were short on time for all of these little things, but we're definitely going to polish it. We're stil at our firsts game Jams ! ( second for me, first for Itchig0 and a bit more for Romain ), we still have a lot to learn, so thanks a lot for your feedback, it'll be useful :)