Nice entry, clean UI and overall scene. Nice SFX and little details, projectiles, particles, splashes. Good upgrades.
On Soundtrack, perfect vibe, I'd make a few more variation on the theme so the segment that repeats is a bit less repetitive. Early game, I'd increase a bit the enemy density; in 2 separate runs I'd travel a lot of map to find something to hit.
But I liked it, GG WP!