Great visuals and music! I love a retro look and you did a good job with it. I would have welcomed an echo-y footstep sound.
The game got progressively spookier, which I enjoyed.
Collecting flowers is a nice contrast to the spooky setting.
I was not happy restarting completely after dying on the third floor. Because your gameplay is just slow walking, losing a few minutes of progress like that feels really really bad. Doubly so because I wasn’t really aware that I was in danger when the walls started moving (I had not been in danger yet in the game), and by the time I realized it was too late to make up for the lost time. I did not finish the game because I didn’t want to replay the first two floors. Honestly I think just a basic sprint would have alleviated this, though it might’ve messed with your pacing.
Mouse sensitivity seemed kinda low, a slider would have been welcome. Also, I lost mouse control after dying.
Overall, nice job!