The game is pretty good overall, but I had a few issues with it nonetheless.
1. The spikes were very hard to spot. I was confused and frustrated for 2 levels before starting to be able to spot them. Even if it was intentional, that's not a feeling you want to give to your players.
2. A fast forward button for the ghost would feed great, instead of having to reset every time you take too long.
But the strength of the game are as follows:
1. Nostalgically gorgeous 8-bit art.
2. A great concept that works well both on paper and in reality.