Hi, second dev from The Last Revenant's team here, you've done an incredible job with this demo! I got swept away by some other funny-looking games that I ended up rating first, but I always intended to prioritize yours as this looked really interesting even just judging by the cover art, and I wasn't disappointed. Easily one of the best sensory experiences I've had on here, with the player's animations specifically being a highlight of my experience.
The gameplay concept as well - despite being unfinished - was really intriguing and unique. Not only the bubble shooting, but switching between the water types as well. It almost feels like Metroid Prime 2: Echoes' system of juggling between Light and Dark areas to progress through the game's world, and it gives a weird amount of structure to a game world that could otherwise feel really empty and directionless.
If I could give some constructive advice, I feel like you could still tweak the freshwater physics a little. The extremely high jump isn't necessarily bad, but I feel like you don't get enough horizontal air momentum and it feels a bit janky. Also, while I fully recognize that it's a demo, and this point didn't really affect my rating, in the future you might also want to make sure to prioritize adding some kind of health/death system to the game before releasing it, because restarting the game after every death crash got pretty frustrating while I was still learning the ropes. Otherwise, I think there's some absolutely amazing stuff on display here, and would love to see it getting a finished release!
