Hi Shawn !
I'll reply to you as well here, because I think you deserve a more dedicated answer.
As said in the jam's comment, I'll most probably continue working on this game, first to fix bugs, then probably to add features.
Concerning the sounds, I'm happy with the horn but not with the constant sound, it's not matching the rest. I'd have loved to find sounds like in Zelda Spirit Tracks, but it was too hard to find with the remaining time (and I could not ask this to my kids).
It's thanks to comments and kindness like yours that I'm proud of myself. Again, thanks a lot.
See you in the next jam ! :-)