I thought I might elaborate a little, too. Only (very minor) criticisms I can think of is that it took me a while to figure out that I needed to pull the bridge out to go left from the heart gate, but I got there in the end. That, and the clicking to interact text. I would frequently get confused about which button to press to examine, advance text, and dismiss text, and would often do the wrong thing by accident. Just a couple quibbles; nothing very major at all.
Several specifics for things that impressed me:
When I read it was voxel-based, I thought it was maybe just regular assets rendered with a highly-pixelated overlay or a forced low resolution. I've seen people try to do that to pass stuff off as voxels when they clearly aren't. I was pleased to see it was actually voxels, as it lends a sense of otherworldliness and childlike wonder to the game. Maybe because it makes me think of LEGO, which seems to fit the setting really well.
Speaking of otherworldly, the whole eyeball section blew my mind. The way the background shifts as you move is just mesmerizing without being too disorienting.
Descriptions while examining the room gave a good sense of who we are playing as, and I felt that I got good insight into the character.
Again, I loved this and am really looking forward to more!