I reached the end of the demo, and I liked it! As others have already said: the camera could use some work so you can better see your surroundings. The pixel art is looking really good, but I would suggest trying to keep the pixel size consistent between everything. Right now it really feels like there are several different styles put together with the player being scaled up and enemies are being scaled down (maybe multiple different people contributed art for the game?). If multiple people are working on pixel art for one project I would suggest using one texture (for example the player) as reference and use that to decide how many pixels wide/high all the other textures should be. That way the whole art style of the game will feel more consistent.