Good game for first :D.
just i think it will be even more, if the player rotates to face player cursor for easier aiming and it will also make the freeze more useful cuz players can aim and kill much faster.
and the menu i think you should make the text darker when hovering to make it readable,
also i think it would be nice to limit the number of enemy that can be spawned to make the player not be overwhelmed.
lastly just a question :D did you put that Development Console at the bottom? this too is my first jam so i didnt encounter this b4.