Jumping seems way too abrupt - it appears to just set my position up a couple of blocks. Why not either:

• Use multi-threading to, over a few frames, move me up a bit
  or even better:
• Use velocity to push me up

Additionally, if you're underneath a block and jump, you soar up to the top of the screen. I assume this is a side effect of your method of simply setting my position when I jump.

Other than that, not a bad game - only decent one I've seen on pygame for a while

I'd very strongly suggest cleaning up your project file-system. Instead of having all assets, source and what not in a single folder, why not do something like this?

• Deeper
  • src
    • python
    • compiled
  • assets
    • images
    • sounds (but I'm not sure if you have any at the moment)
    • fonts
  • worlds