I really liked the graphics and the music and sound effects! And the idea of a shooter, where you actually are shooting with water is brilliant!!! I do not like shooters because you have to use weapons, but here, you are actually saving house from the fire with water :DDD So there I felt like, yeiii, yupiii :))
And as a feedback, as other people already have pointed out in the comments, it was a bit too hard to actually "kill" the fire and I kept dying and getting back to the start. Maybe at the begging it could be a bit easier, lets say to put down the firing stars by just two or maybe even one shoot from the water. Because as you are running and trying to avoid the other fire around, it is harder to aim at them. I also a few times after I died, I could keep playing as a ghost, what was maybe a glitch.
But if I were you, I would definitely continue with this idea after JAM, it is original and as a platformer, if it had a bit more balanced difficulty and some more saving spots during the game, this has great potential!!! Wishing you just the best!