Thank you very much. We streamlined the movement a bit, but we didn't change too much of the core movement since we aren't sure if it is allowed. We noticed the freezing, it happened for me personally when you enter and jump out of the water for the first time. We also added hints on the boss room, is it perhaps not enough?
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I ended up figuring it out after realizing the freeze wasn't actually a freeze and just a very long load time. I would've tried going up and sliding earlier but in my first playthrough I was afraid of it crashing lol.
So with that in mind I think that there still needs to be some kind of hint towards the slide being used as an attack. I know you have that for the doors, but maybe if you added some destructible boxes or something to slide through it could reinforce that. (that first slide tutorial is a prime spot for it imo)