Cool game with a big effort on animations! I really liked the run cycle! It is really strange to see this quality for the character on a really simple background. Maybe you had problem managing your time.
The controls are surprising as the character hasn't air control but slides a lot. I feel like not having air control is really realistic and that's interesting, but sliding feels really arcade and it was a bit strange.
There is some little bugs too. The character can stand-up in tunnels, the music volume option doesn't work and the sound option launches the game.
And I don't see the link with the theme really... Maybe you can explain to me, I am a little curious about it :)
I see you were 3 to make this game and I know everything doesn't go as you wish in teams. I made 3 game jams as artist with family and friends and we often had communication issue that caused time managing problems, so I can understand, but I also know that it is really a cool sensation to work as a team on a game :)