First off, best use of FlxParticle I've seen this jam period. Nerdy thing to say but man that water splash is spicy. I'd only suggest you add a bit more punch to when a drone dies, it feels good with the laser but with the gun it just feels weak and not impactful, and overall may be a bit confusing when a drone actually is dead (especially if they collide with eachother.)
This game is impressive but it lacks an ultimate goal. Achievements or a score counter or something would go a long way to making this game really mesh. Additionally, I can't help but feel there's gonna be tons of people who are gonna give this one a bad score just because they didn't know about the laser. Why is that not the default weapon, really? It's so very satisfying, I'd honeslty consider dropping the gun from the game entirely because the laser is really just that fun to play with.
Honestly, I think you should keep working on this. It has a lot of potential for a full release. Give it some unlockable skins, get some collaborators on a small retro OST, you really could go all the way with something like this.