On the right side, you'll notice that a number of big tasks is shown. These are tasks that I need to complete for the game to be considered complete.
Without spoiling what they are, they are: (nonspoiler method)
-Gate H (The final optional gate)
-Redo the Gate D boss encounter (Cause he sucks)
-An optional, but not really optional, boss that I can't spoil
-Gate 6 needs touch ups based on some heavy suggestions (that were requested by me) from Slaix
-Cave Network (That mysterious one map hidden place-thing you all saw in the demo)
-The final pass through the game to fix/add all the stuff that isn't fixed/added. All the content is in the game by this point. It just needs a polish pass. I'll be announcing a release date when I get to this phase most likely.
Some of the above won't take very long so it'll get scratched off the list pretty fast.