I love the look of this game, reminds me a bit of an old Atari game. I did have some issues picking up the bombs. If I had to guess this is because your CRT shader is warping the screen at the edges, causing the actual cursor to be misaligned with the thing you're trying to click on. To fix this, I'd recommend making a cursor that exists under the CRT effect. You can pretty easily have a Sprite2D that follows the mouse position, plus you can hide the user's computer cursor. I used this effect in my game SUFFER.er if you want to see this effect in action.