I really like the concept, though I agree with other comments that the goal should probably be points based rather than time based for a game like this. All in all, well done!
I also saw the comment where you made it a point to add the leaderboard using Lootlocker. I really wanted to get that in my game too, but ran out of time. Life got in the way a bit for me during this jam. I won't add it before the ranking periood ends, but I will afterward.