The standout element to this game is the tutorial and on boarding for the player. Even for someone like myself who needs a lot of hand holding when it comes to games, I at no point felt confused as to what my goal was or how to achieve it. Due to this alone, the theme of expansion is buried deep within this game’s DNA. The enemies also expand in scope during the playthrough which is a nice touch!
Also dig the concept in general. The limitations on shooting angles and actual bullet travel (rather than hitscan) force you to engage your brain.
Are you developing this further? I love what you have so far.