The aesthetics and atmosphere here are very nice. I'm always a sucker for cute low-poly games and it excels at that. The slimes also all have a really cute look to them! The room with all of the furniture is really well done, it forces the player to explore and use the games mechanics to discover the slimes, and I like the variety of the rooms in general.
Unfortunately, the gameplay was lacking a bit. Throwing the slimes is fun, and the weight mechanic is a unique idea, but there's no way to determine how heavy a slime is before you throw it. This is okay and adds a bit of challenge but missing a slime through is far too punishing, requiring the player to restart the entire level. In my opinion it'd be a lot better if the slime respawned so while the player is punished for missing a throw by needing to go and grab that slime again, it avoids the player feeling punished and having to restart the level for something that was entirely out of their own control. Similarly I felt that the mouse sensitivity was fairly high, and with a game where aiming is a fairly core mechanic it would've really been nice to have a sensitivity slider, but I completely understand not having time to implement one.
The maze room is also pretty poorly designed imo. I understand what you were going for and trying to add a challenge, but it feels like it was thrown in just to add an additional challenge for the player, and is a bit too challenging. When the player first enters this room all they see is a slime at the end of a maze they can barely see, with the light flickering, and when the light is off its essentially impossible to progress as the player can't see the maze at all. The room itself is fine as a concept but two things I think would have made it better if the maze had slightly more contrast with the floor, as right now even with the light the maze is still only barely visible, and if the maze was still at least somewhat visible even when the light is dark. This would allow the player to choose between if they wish to take the longer but safer route by only going in the light, or taking the faster riskier route by travelling in the dark.
There's a very solid concept here, and this game could absolutely work as an exploration puzzle game, and it has a very solid atmosphere, but it definitely needs a little bit of work to be truly great!