I liked the concept, although based on the way that the character controls (building up momentum to create speed) the level design could benefit from a bit more open area / pits to jump over as opposed to walls that break that momentum. Given the level design already guides the player down, I'd lean into that a bit more and allow the player to just run and jump towards one part of the level (kill some enemies along the way) and then move down to the next section. All in all though, great effort for your first GWJ submission!