Sadly that is the entire game because of time constaints. I always do the level/s last so I have an almost 100% complete game at least with a small level at worst because everything is already complete.
If you and enough people enjoy the game enough and give a good rating, I would be happy to make extra levels and mechanics, maybe 2 or 3 enemy types for example. Make sure to follow me if you would like to be notified when for when a part 2 is released if one is made.