The first thing I would look into is the fact that the player's movement speed slows down greatly when he collides with an object, even if he's not walking into the object. I walked upwards into a wall, and then my horizontal movement speed greatly decreased. This made it hard to navigate in more dense areas, like the forest.
I would also recommend some more detailed instructions when obtaining new items. It took me a minute to figure out that I had to hold the space key to use the drill.
Apart from that, no real complaints. Good job!