This was a pretty fun platformer with a unique focus on sliding. The controls were a bit hard to handle at times, since it felt random which slopes make you move faster while sliding and which ones don't, but once I got the hang of them, it was really fun to zip through the entire level. The key system is a nice way to add more depth to the level, since you're going through it in two ways and the terrain can do different things for the player both times. However, I felt that the zombies moved too slowly to really be threatening, so there wasn't much incentive to hurry in this part. Overall, this was a solid entry! I got up to level 5 before I couldn't go any farther.