Absolutely adorable artwork! The main character in particular was great, with a lot of expression and animation in the small sprites. The music and audio was all great! The lighting mechanic was good, I liked how that worked, and the occasional puzzle using it. The end boss was also a great idea! I always love big, imposing bosses. Very cool. The story was fun too, sort of like a happier Madoka.
The actual controls and movement could be a little frustrating occasionally... I'd get into bad loops of falling in insta-death slime and down spikey drops over and over again. Also almost didn't figure out how to beat the boss... I figured out where the missing lights were in the nick of time. Maybe I just wasn't observant enough, but those were tough to notice. There was a small bug there too, the music stopped playing during the fight.
Despite the few issues I ran into, this was overall a really great game! Hope to see more from you!