i cant remember the name of this game

Aug 14, 2018
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i played this game ages ago, you are a 2d man that can move left and right along the screen, the floor is always flat. the objective is to shoot the different sized balls that are spawning in the sky without getting hit by them, when you shoot them with your weapon (thought it was a spear but cant remember) they split in two, this happens until they reach their smallest size which then when you shoot them they disappear. when you shoot enough you go to the next level also if you shoot them theres a chance for them to drop a power up. any help finding this game will be greatly appreciated. oh and i had to use an emulator for the game, idk what platform its for