The first level gave me some issues with lighting but I had a pretty good time here. The rocket jumping mostly feels good, though strafejumping emulation could improve it. I would maybe try to block off the outer edges of the map as it is possible to get inside the hillside; I also wondered whether the island at the very top of the map was actually accessible, and some kind of signposting could potentially improve this.
Congrats on getting a submission done! I wish I knew how to do this kind of thing in Unreal.