Good job on trying a new engine for this jam! It can be daunting to familiarize yourself with something new especially under a tight deadline, but it's great that you were able to create something with it in time.
As for the game itself, I think you were able to nail down the premise of the game well. I think what the game needs from here is just an expansion of the mechanics and additional polish to make this game more engaging. Maybe add more enemy types, more hazards to face, and some audio & visual effects when shooting at enemies to make things more satisfying.
But overall, good job!