Hey! I'm really glad you liked this little demo-game!! and yeah I do plan to extend this into something that is actually playable lol, by time I got to the enemy side of things I pretty much duct taped things together to have something to show for the jam, I have already completely re-made the enemy spawning, artwork, movement during & after waves as well as them attacking the player and the player having a "knock-back effect" when hit by an enemy.
Balancing is something I am really not good at so I usually have my friends play through it and see how much they can break and I will be doing that as well in about a week! :D