This was fun to play! I think I killed boss 2, the keycard appeared but the Camera suddenly zoomed all the way out and I couldn't pick it up for some reason (was it intended?)
I like that there are multiple upgrades and quests to do. Once I got a gun, the game became a lot more fun because I actually had much more fighting chance against the robots. Then I saved up and went for the machine gun, which was a really solid choice.
If I may give one suggestion, keeping the pixel size the same would be nice to help with visual clarity/style. Things were a bit far from one another (especially when trying to get to the second boss), and but other than that, the gameplay was solid with all the weapon choices and upgrades. Good job!