this game is kinda boring since it doesnt have challenges (all you do is hold the mouse and shoot.) maybe add a leveling system and some big and small enemies.

why is there a huge X in the top right?

Sem desafio, o jogador pode continuar o tempo que quiser e só iria perder se também quisesse.

Basic idea was okay, but the complete lack of challenge meant this got old quickly.

I wrote this entire review whilst keeping the game running, and didn't struggle at all to keep the red balls at bay.

Playing this reminded me of -Red- (https://www.newgrounds.com/portal/view/341598) - I'd recommend playing that if you want some idea on how to improve this.

(Final score for this was 364, after I waited for an eternity to lose.)