First off, good work fam. :)
It looks like you have a fun little base for a game, I like that you called it a demo.
The pacing needs some work and from I can tell there are no times that you take damage from the enemies which makes it a bit dull and kind of made me feel bad for killing the ones that were just locked up. I dig the art style and hope y'all keep working on it.
Side note, this seems to be a development build, not shipping so you can see the print strings go out while playing. Oh and if you force capture on the mouse it should prevent the player from being able to cursor out of the game while aiming for the next target.