You got a functional game submitted that is great for your first game jam! I like the level design with obstacles narrowing the player's shooting lanes and the UX indicating when the next wave is coming in.
I didn't hear any sound effects or if the music was playing over it. But the music is good though I was able to tell when it looped.
GameDev.tv Game Jam 2024 - Free Course For All Submissions! » Entries » Last Stand (gamedev.tv GameJam 2024) *UPGRADED*