An interesting idea. The difficulty increases exponentially when you are looking for stones to survive. A wide variety of enemies with its simple AI and nice graphics. One thing I don't like: it's hard to run away from the crowd and shoot back, since you only shoot in the direction of running. This is logical and adds complexity, but a little annoying.

Game was pretty chill and fun. My critiques though would be

• maybe have the music also on the menu, 
• some of the pixel art was inconsistent in line thickness, 
• the music seemed to be lacking composition but was pretty nice
• also maybe add the ability to shoot diagonally. 

The level concepts and animated transitions were pretty epic, the enemy variations were pretty cool too , though i wish there was more context to the game, maybe a little panel at the start giving a backstory and controls would help!

Overall pretty chill, the theme I suppose was there, just lacking a proper scenario/backstory as to why a drone is following you and ur collecting rocks. 

EDIT: just realised the rocks were being thrown at the drown