I absolutely love the story of the game! I think hardest part for me was controls because it was like player was on the ice. For the music, I wasn't sure it was intentional or a bug but when you use your weapon I think one of the music stops. The art of the game is so nice and I really love the character in the checkpoints, reminds me of GLaDOS <3 Very nice game, I enjoyed playing it!
.
.
.
....
One last thing: I think I found this bug : The game lags when I die and press X (instead of Z)