Took me a while to set it up. My PC isn't the greatest, so I had to keep lowering the anti-aliasing settings, only to discover that the game still doesn't run smoothly, forcing me to restart it yet again. In the end, I had to turn it off entirely in order to get it to perform well, which doesn't look too great, but is still tolerable. Wonder what kind of anti-aliasing technique the game uses. Seems to be a pretty resource-intensive one. Not sure if a 2D game really needs that.
As for the game itself, it's really fun so far. It has a very playful feel to it that encourages creativity. It's an interesting change of pace that this game doesn't kill you off nearly as often as FiNCK did, yet gives individual deaths far greater consequences. I was also pleased to discover how non-linear the game is. Furthermore, the physics are a considerable improvement over FiNCK, which feels a bit rough around the edges in comparison.
I also find it impressive that Nifflas made a few last-minute improvements to the game. I watched the three preview videos it received prior to release, and it seems he added new explanations about the difference between large and small doors as well as how to use birds in response to one of the Let's Players not figuring these things out as quickly as intended.
Regarding the soundtrack, I'm not consciously noticing most of the individual ways in which it adapts to the gameplay, but it feels a lot livelier than in Nifflas' past games as a result of its adaptiveness. I'm curious to see what he'll do in this regard in the future.