I really like that you were willing to take a risk and make a twist on an established genre. Unfortunately, the premise of the game really disincentivizes the player from playing well and rewards bad play. The average player wants to do well and be rewarded for doing so, not be punished for it. . I think most of this criticism simply boils down to a lack of reason. Why kill things if losing makes me stronger? This is obviously something that could be remedied with more time and thought but, as is nature of a game jam, unfortunately, could not get there. I do love the unique twist on the roguelike genre though, so you get an A in creativity :)
Also, Godot Wild Jam this Friday! I hope to see you there!