Interesting idea! It's similar to mine actually, the idea of controlling two weapons at once to fight back a swarm. I found myself confused by the UI though. I eventually realized the number in the bottom right corner was the time left, but the other two I didn't know what they were. I figured one of them was probably the score but couldn't really tell.
Some suggestions: 1) I would've liked the colliders for the guns to be a bit smaller. Often I felt like I should've gotten them because they weren't quite touching me. Also programming in that little bit of leeway in different places helps make games more satisfying (imo). 2) Might want to experiment with manual control of firing the bullets. It was frustrating sometimes when then gun would shoot just before I had them lined up and it often felt out of my control. For example you could have the spacebar fire both guns and when they're ready to fire again (same delay as now) it makes a little click sound or something like a reload.
Congrats on your first game!