I am going to as many games as I can on this jam and leaving constructive and positive feedback.
Constructive: The camera felt too close to the character and most my UI didn't fit to my screen properly. It was a similar issue I had with a previous Unity version. I also think the game could be made more fun by adding some height with jumping mechanics and other places the enemy can spawn. In its current state on either difficulty I could just sit in the back of the map spamming space and never see an enemy. Some resolution was lost on the player character, there are tutorials on how to keep pixel art sharp that I think could help.
Positive Feedback: Visually the game looks nice. Its a very simple game loop so knowing what to do came quickly. The walking animation looked smooth and the enemies had a nice variety.
Overall a visually nice looking game with a simple goal. I personally think more areas to navigate and defend from would improve this game and build more retention on the player to keep playing.
Nice Job!!
Keep joining more jams and remember to have fun!!! Practice will only make you better!