Great aesthetic. The game looks pleasing and coherent. I personally much preferred the look of the sunny dimension as opposed to the iced over one, because the iced over one didn't look iced over at all. It just looked blue, but I'm knit picking.
The song doesn't loop perfectly, producing a jarring transition. There are no SFX.
I found carrying gear on the mouse innovative, but also weird and confusing at first. I then accepted the situation and ignored the random floating stool and bear.
The game had me captivated at first, but I grew unentertained fairly quickly when I realised I was doing fetch quests in a sequence. It turned into a "find the area where you have to press space" adventure for me.
The camera lerps are strange in at least 2 situations:
1. When the world wraps the camera rushes to the other side. This is arguably good behaviour, as it tells you what's happening fairly clearly, but it also causes play downtime.
2. Transitioning from an interior area to the exterior and viceversa has the camera move weirdly.
For both, I think I would have preferred a straight plain cut, perhaps after a quick fade to black.
The theme has been hit quite well, I think. But while the game was presented well, I didn't find it particularly interesting or enjoyable to play.