I generally use FL STUDIO. The files are .FLP
Then I convert them to MIDI (.MID) and from there I pass them to other conversion programs.
The game is beautiful and with an interesting development.
Maybe in future versions you can fix that inertia it has when you are falling after jumping.
The music is nice and friendly.
I would put the sky in a slightly darker tone.
Overall very good work. A game that invites you to not stop playing.
The soundtrack is luxurious. The sound section in general is very well taken care of.
The graphics are also very good.
Perhaps its weak point is in the gameplay as it is a conversational game.
Still, it's a great production.
A set of assets of all kinds, music, images, effects, sprites, backgrounds, etc., that can be very useful to all those who love pixel art.
The idea seems fresh to me in a world saturated with games that imitate Mario.
I think it's a brilliant idea to be a centipede, what at first seemed like a children's walk is getting more and more complicated.
Good luck with the game!