The introduction and how smooth it goes into the main menu was near perfection. I liked the platformer aspect of the game. It was fun especially due to how responsive the controls were. Art and music of the game was very well done, and the narration added a nice touch to the whole experience. Reminded me a bit of Portal. Having your heart jump out was a cool mechanic.
I did notice some black flickering most of the times.
One thing I realized is that you could easily cheat in some of the puzzles. Jumping over gaps or rails. I don't know if it was intentional but I was able to jump on walls and wall-climb. Allowing me to bypass the blue barriers.
Overall, a fun 3D atmospheric platformer with a cool introduction.