Currently:
Tuning some stuff
Adding visuals and sound
Lots of bug fixing and optimization
Developing the "Invasion" mechanic
...and so. much. more.
Eventually:
Addition of "hybrid" enemies
An evolution system!
Descriptions and flavor text
First boss (preview?)
Replay Incentives
Far Future:
Initial design of the next game (tower defense mixed with farming sim)
Custom soundtracks for current and future games
Eventual goal game of this journey