The idea of platforming adventures with a yo-yo has a lot of potential! I would suggest keep working on this regardless of the feedback you receive. The music is excellent, the platforming needs tightening (jump feel mostly), and the art is charming with its own style. There are some sprites that need more attention to make them recognizable, and it's sometimes difficult to tell what you can and can't climb or land on. For your first game, this is impressive! Great job and keep it up!
*I would also consider uploading a standalone executable version instead of the installer, as I think most players get deterred by those extra steps despite having to tell Windows "it's okay to run this" when you use the standalone.