Thanks for the feedback. We actually were thinking about adding to this game and most of the things you mentioned adding were part of the original idea. I was going to add the manual but ran out of time. I actually added a powerups menu but it was extremely buggy and needed to be reworked. My friend who made the art for the factory modules already made several more weapon types and different types of drills etc. but i didn't have time to implement those either. If we do continue working on it i hope to use A* pathfinding to allow for more interesting map design. right now the drones just fly straight toward the player.
I never considered adding armor upgrades but that's a great idea. same with having an end point. adding several different levels to be unlocked would be fun. i would probably allow the player to survive as long as they want and skip the end goal if they would like to.
If the game does get updates there will be devlogs on my youtube channel, code waffle.
Sorry about how long that message was. Thanks for playing the game, and I'll be sure to check out yours.