Got a weird issue on level 6-2, I saw a gun but without player and I couldn't progress (music was playing but the game didn't respond to any input). After I refreshed the page I got no high scores for the levels that I completed :(
Still, I manage to choose level 6 from the beginning and complete the whole game, so it's not a big deal. It would be nice if you save them between page loads. Music was lovely (the best part of the game for me) and the amount of levels are simply amazing for such a short period of time that LudumDare gives.
I think that I'm in a minority but I wasn't super happy with the character control, the gravity was too strong and movement too sensitive for a game with insta-dead mechanic like spikes. Many falls into the spikes seemed unfair because of that. Don't worry about it too much though, the game is still really well-made and you can be proud of yourselves.