Aww, that was way too short, I really wanted to keep playing! It definitely looked like there were gonna be additional paths to explore with a double/high jump ability, too. Also, Windows complained about a firewall when launching the game for some reason.
The graphics and music were gorgeous, and the character movement both on land and in water was some of the best I've experienced in the gamejam. Also, was that the Lego crystal piece as the wall crystal decoration? If so, that's a really funny little easter egg, haha!
The combat was nice as well, although the super short range of the melee made it a bit hard to hit enemies before taking damage, especially against the bats. (Also, bats underwater?,..) Also, it'd have been really nice to be able to attack while crouching on land, since all enemies except the boss were shorter than the player.
The duration of being unable to move while shooting underwater also felt a bit long, considering that there shouldn't have been anything to get stuck on! Nothing too major, but it just felt a bit jarring during the boss fight. That said, the boss fight itself was pretty cool and had a nice amount of difficulty for a first boss!
Overall, really fun game, I'd love to see more of it! Great job!