Okay, so if I'm making sense of this correctly, you guys built an entire pixel-based physics system with temperature and electricity for a game jam? Thank god for open repositories, because I would not have believed you otherwise. The game is really good!
The game itself is great, the puzzles are well-designed and required more out-of-the-box thinking than I was initially prepared for. I spent far too long on a couple levels trying to think of an intricate and complex answer, only to find that it was staring me in the face from the start. Playing around with physics to find the solutions was very enjoyable, and it always felt satisfying once I worked out how to continue. The only consistent issue I had with the gameplay was that some solutions were dependent on me using a fluid to push the duck in a direction, but due to inherent physics randomness it could take me a couple tries before the duck would actually move that way, rather than bobbing back and forth or moving to the opposite side. Once I knew the solution to a puzzle I could repeat it to get back to that point and try again, so it wasn't too annoying- but it was enough for me to mention.
The visuals of the game are cute and simple, fitting very nicely in for the gameplay. I wouldn't've minded a backdrop in some levels, but that's a minor thought. I do think it would be worth changing the colour of electricity, though, as it looked virtually identical to the water and took me a minute to understand was separate. The menu UI looked great, I loved the mini level previews! I'd also like to quickly note how much I enjoyed the little taglines for each level, they were really charming and made me smile while my brain recovered from the puzzles, as did the duck sprite itself :)))
The gameplay didn't really have much audio, there was the background music and reset sound as well as the UI noises, but nothing really beyond that as far as I could tell. The game could definitely have done with some more audio throughout, to add a bit more texture to the gameplay. Maybe a water splash when the duck falls from a height, or a crackle when things are burning? I do, however, understand that with an open-ended physics system it's much easier said than done to implement audio for specific events like that- so I'm not too fussed on it for a jam submission. The music was good too- but unfortunately got a bit annoying after a while.
I'd love to hear more about the development of the physics system too, I had a dip into the code and its history and there seems to have been quite a bit of thought put into it. Overall, really well-made game with charming graphics and difficult puzzles :)))