Pretty nice gameplay, I played just a litte bit but I'll see if can beat the whole demo later.
There is a bug that after attacking sometimes the camera gets stuck and you can't select the unit anymore. Also something that annoyed me a bit is that sometimes I skipped text/tutorials by accident while clicking spacebar, you could add a bit of delay so that you can't skip it before even the prompt appears on screen.
Another thing, Enemy health bars should be of a different color, so you can easily see who's an enemy.
I'll tell you the truth, when I heard the game over music I laughed, I wasn't expecting that. Phase 2 never...
That said, I really think you should invest more time on the art. Even if you're going for a "looks amateurish but full of soul", your art is still kinda lacking.
I'll give you a more thought out review after I beat it.