I don't like games where the gameplay comes down to walking around the map, but this one hit different. Maybe that wasn't the intended experience (I didn't know about the scroll wheel feature, which significantly simplifies the game), but I had a lot of fun memorizing the levels, figuring out the most efficient routes and trying to keep certain room numbers in mind when doing deliveries. Managed to beat the game with 4:14 time left, by the way.
Some other commenters said that level 3 was too hard, but I think it's in a good state right now. It's more fun when the difficulty increase is not linear, when different levels have some kind of personality. You enter level 3 and it's reasonably hard, then you finish it and expect something even harder. But you get a level 4 instead, that is pretty chill and lets you catch a breath. You think that maybe level 5 won't be so bad, but then you enter it and it's absolutely brutal. It's like a roller coaster.