Great game! I got to wave 10, score 7415 my second. It runs awesome even with a ton of enemies and projectiles, is it a custom game engine?
Nice title screen that explains everything. I noticed Codex doesnt seem to be working, it is always empty for me, but really cool idea. Good in game presentation also and nice pause menu.
Gameplay wise it would help to add more variety to the enemies instead of just increasing how many there are. So that could effect their movement, bullet patterns, or give them other abilities. I had trouble using the rocket, not sure if it was working properly but it did not work as I expected. You should consider adding music it could help add more atmosphere.
Overall really nice and impressive work!