Hello, I don't want to be too harsh, but the lack of graphics is quite displeasing to the eye, but it isn't a big deal for a 3 day project. Now, let me move onto the main problem of the game. As it is, your game is hard, not challenging, but just hard and the main reason is that the gravity is too low, while the obstacles' velocity is too high. Once the player has jumped, the amount of time it takes to reach the ground is ruining everything, obstacles become hard to dodge and it's a bit annoying. Other than this it's just a simple platformer so I can't offer any more advice, but I really like the music you've got going, I can see that you put effort into this, technical skills like artistry and game design will come naturally so keep making games, sorry for not offering any more constructive criticism. All and all this is a good effort, well done.