firstly, thank you for your comment! feedback really helps me.
Secondly, regarding the sword (like the hourglass, the cards with the green arrow are upgrades), the sword is a damage upgrade. It must remain in your hand to deal more damage when attacking. I forgot to explain this in the rules; I'll update them.
and thirdly, regarding thegameplay issues (the white glow when selecting an enemy part, the numerical costs and interfaces, and the general lack of polish in the gameplay), I couldn't do it the way I wanted due to time constraints. However, I would like to offer the experience I originally planned, much more polished, so the game will likely be updated once the game jam is over. I hope you'll check back for updates!