This was quite the addictive game I must say. While I do believe you have a solid gameplay loop I do think it could use some improvements. First is that there needs to be some sort of delay at the beginning of the game, either like a menu screen, a countdown, or even just having a bunch of empty space to get used to the controls would go a long way as how the game stands now it just thrusts the player into an obstacle that they couldn't see coming. I noticed in later levels though is not as bad as there is some, albeit brief, time where you can see the obstacles approaching which kinda makes the first level get off a bad first impression. And secondly I think the controls at time are too sensitive, especially for a game that requires precision movement, that makes some deaths feel unfair. On a minor note I couldn't really tell how this game fits the game jam theme. Overall though I think you did a great job creating a difficult yet addictive experience.