I enjoyed this game, and I almost passed it. On the third level, when I thought I passed it I actually died. When a black screen with the text "survived" appeared, I relaxed, and I thought I had finished this game, and then this text switched to "dead." It is probably the biggest issue of the game; it continues playing even after showing you a black screen, and you can just die without any ability to prevent it, and it adds to the frustration because the game is generally difficult.
But I still love this game!