Overall a nice idea! It plays into the jam theme very well. I also like the sounds and music.
There are some bugs like the restart button not working after killing the rock creature ( :( I'm sorry, it wan an accident ).
The movement and collisions also feel kinda clunky and I once built bombs around myself and couldn't leave or restart the level. I had to restart the whole game. You should make the player able to walk through bombs or at least be able to restart the level by pressing R or somethin like that.
Also, Instead of making the player download a few files separately, you should try making a web build or at least package the 3 files into a zip and make it a single download. It would by much more accesible and I imagine it would grant you more ratings in the jam.
Wish you all the best in future projects! :D