I died a lot - the first times just because I went to deep without knowing any key location :D
But I did not mind. It had a bit of a groundhog vibe to it. I used my first few rounds to search for the keys and then tried to optimize my path. I think the top level thunder and the thunder clouds are quite good enemys. You kinda have to stay underground or under ledges and on the other hand can try to out maneuver the cloud.
I spend quite some time with the game but yet have it not beat. Maybe I will revisit it later ;)
All in all a cool game. I like the jump and run feel. It is imho quite hard to create good jump and run mechanics. Even more so in a Game Jam game but I think you managed.
It is a great entry and I hope you had fun creating it!