Thanks for the review! It's cool that you detailed the scores. Having just the three buttons was what got me hyped for the jam, I was felling a bit discouraged before and the idea of trying a "Jump King but metroidvania" and the challenge of how much metroidvania can we make with just 3 buttons. We thought about adding more buttons, but in the end it felt off from what we set off to try.
The expand and sell will relly a bit on the reception from the jam, probably getting to the top 5 and getting a bit of traction. 'Cus it will need a lot of rework, like you said more buttons, a better room/screen system to have more variety in the rooms.
Could you, if possible, tell a bit of why the final boss felt like nonsense? We didn't manage to test him with other people and to us he was kinda easy to snipe, so maybe I went a bit overboard trying to avoid that.
It's easy to say if you missed secrets as there is mainly just one and some optional upgrades rooms: "Did you became the One Winged Ninja?"