Really cool concept. The idea immediately clicked for me and I had a lot of fun. Impressive work for a jam. The jump in difficulty on Level 3 was quite harsh though, but very cool to see the possibilities this idea offers.
Have you tried spawning more than 1 crystal at a time? Travel times could be quite long, but I can also see why you chose to spawn only one, since moving around the map is the main mechanic.
Anyways, really cool game and to see someone else joining the jam with Unreal Engine. Always feels like we are at a disadvantage :D