Cool idea! Love how each of the three characters has a distinct personality. :) The UI is a bit clumsy though: it's difficult to select a specific character when multiple of them stand close to each other and a radial menu around the character for selecting an attack would've probably worked better. I also would have loved numeric HP values and a minimum/maximum damage range for each attack to better gauge the impact of my actions in advance. Currently your success is mostly determined how lucky you're with the rolls of the more powerful attacks. I liked how important positioning of your characters is, even though I think that might have worked even better with grid-based movement (which would also solve the issue of hard to select characters as they couldn't overlap anymore).
In my first run I ran into a bug where my turn wouldn't end. I guess it was because I accidentally killed off my healer before moving it and then the game kept waiting for me to move it?