First off, the game looks great. Really enjoyed the health indicator in particular, I loved that it was unique but simultaneously intuitive.
I think I struggled a little bit with being able to visually assess all the projectiles on screen, as they're pretty thin and concealed by the screen overlay/HUD graphics.
The Freeze mechanic felt great, as soon as I started feeling super overwhelmed it felt very nice to be able to pause time and mow-down enemies.
In short, great work! Especially for you first entry. The pixel art rocks and so does the menu, so kudos to you.