This was pretty fun. Having 3 weapons to use was nice, and the flight and boost controls both worked quite nicely too. I did find it pretty easy, as even when I spawned in a whole bunch of enemies, I could kill them quickly enough, and got enough health back from the drops, that I could fairly easily stay alive. It'd be nice to see some more detailed graphics, environment, and music, even if it's just 3rd party stuff.
A few bugs to note: While I do always love seeing explosion.gif in this case it sadly wasn't animating, enemies just left behind the first frame when they died. When spawning in multiple enemies, sometimes they would fly off into the air. And also I couldnt place mines, they just weren't working for me.
Anyways, good job!