It was a pretty fun experience. you nailed the game feel, the shooting felt really good. I was confused about the movement but after reading ( in the game's page ) that you're actually moving the whole level and not the player, it made sense.
The particle effects, hit feedback, sounds and camera shake made the experience a whole lot better.
As others have mentioned there was no end goal to the game, there was nothing to keep me playing it. A score system, just a simple enemy kill counter will make the player keep playing.
But for your first game jam game, this was a solid entry. Good Job 😄.