[I share my rating publicly, because i feel like that's more fair for you and me]
Gameplay: 2 stars → I think more depth in the player controls would help. And i couldn't buy the guns too
Theme: 2 stars → I still think it's a good idea, too bad it wasn't working.
Polish: 3 stars → The player controller is very polished, i like it ! But the enemies and menus don't seem to be. (An anticipatory animation before the enemy shoots would help with dodging)
Visuals & Audio: 2 stars → I think the pixel art looks very nice, but the audio the shooting sfx really ruins the experience.
I hope this isn't too harsh, that's not the goal
Don't hesitate to ask if you have any questions !