Ok so it turns out that it was not a freeze and just a very long load time. The game seems to have quite a few of those (game start, entering water for the first time) so that's probably some kind of optimization problem? I'm on firefox.
I also found out after watching someone else play on chrome that Gura is supposed to have water falling off her when she's in the powered up state. That doesn't appear for me and I don't know if its because of my browser or my potato laptop.
After playing a second time I just wanted to say I really really like the movement in this game. Like if you made some speedrunning levels and turned this into something like a Sonic game it would go so hard.