Post Jam Update

After some feedback here some changes to the game:

- Two more levels, to flatten out the difficulty
- Movement got tighter
- Nim will automatically grab the wall. Release with Ctrl
- Collision got changed back to simple boxes (You don't slide of the edges any more)
- Checkpoints were added
- Hardcore mode was added (only one checkpoint - at the coin)
- Some bugs got fixed (for example getting stuck when restarting)

Hopefully you like the changes and this final version!
Thanks for all the nice comments

Cheers