Wow! I love the sprites! Really nice looking!
The gameplay is also fun. Trying the different ability combinations keeps it fresh. However, having that passive healing always feels like the better option once you've locked in a good ability combo.
My favorite ability has to be Ina's. AOE and pushback helps a lot to build that bar and keep yourself alive. My least favorite was Ame's since teleportation is kind of a double-edged sword. You can escape a dangerous situation, but also teleport into an enemy and take damage.
I recommend adding some kind of scoring system, so that the player can keep track of their progress in the game and compare their performance between runs or against other players.
Great game!