Ok, first off, the good things: The artwork is really good for 48 hours, the effects are really cool, and the little magnifying glass cursor makes it not too much of a hassle to find which things he can hide behind. The slide movement was weird at first, but ended up being really fun!
Now for the criticism:
The gameplay is repetitive and gets tiring fast. Would have been nice to have different levels with varying amounts of difficulty or more mechanics.
Despite the art being really good, there could have still been a little animation to make it feel more alive.
I know you said that "There are actually hints! Admittedly you have to look closely. "Winter" can only hide in some of the places (e.g. not behind a wooden log or a dead tree). If you are standing next to a potential hideout, you can in fact see a slightly different image (of the tree or stone ...) if he is hiding in there!", but the hints could have still been a little bigger. even if you look closely, its still mostly just guessing.
Verdict: The game feels really polished, with visual effects, fun and clean sliding movement, great artwork, cues that make the game less confusing, and fun textboxes. At the same time, the core gameplay loop isn't very fun, and could have spent more time in the prototyping oven. This is an AMAZING game, for being made in 48 hours and by a beginner, so im gonna give it an Overall Score of 4.