A fun game, and I absolutely love the concept. It has a lot of potential, and I think that if you worked on it some more and addressed some of the issues this could be released as a full game! So as others pointed out the increase in difficulty was very sudden and I had a hard time understanding what I had to do. Also the fact that there is no introduction to the later parts of the game had me guessing what would happen. Other than that though I liked the extra challenge of the apple, and the controls and pixel art style really fit the game well. If you fix the difficulty curve and add some more sound effect, brighter graphics, and background music, this could definitely be a commercial game! Well done, you earned a very high rating from me and I hope you get featured in the video! Good luck! :D
Also I would really appreciate it if you would check out my jam entry, Sheepherd Dog. Thanks in advance! :)