I enjoyed the take on the theme here - it fits quite well! The concept of objects in the environment acting differently depending on if it's the day vs. the night is a fun one.
The death system, where you can see where you've previously died and whether you were in day/night mode while doing so is a nice implementation. It allows the player to determine whether they should be in day/night node to get through that part of the level (i.e. if you have 10 day mode deaths and one night mode death concentrated in one area, it implies which mode you should use to succeed at that point).
I couldn't for the life of me complete level 7 unfortunately - the issue with the puzzle (timing the creatures to hit buttons at certain times) is an interesting concept, but you can get hard stuck if you release them all from the bulbs at the same time; you won't be able to get them moving in a differnet pattern without restarting. This was quite frustrating.
Great job though! :D There's a fun game here, and I'd love to return to play after there's been some outside-jam polish completed!