I love the theme of the game, where it really feels like you're in a motherboard or in cyberspace. Dodging lasers, especially in the hard difficulty was pretty fun.
One suggestion is to add powerups. I think adding simple power cups can add lots of variety to the gameplay.
Also as mentioned below, I do agree the difficulty gap between easy and hard is a bit much. Maybe adding a middle ground would be good too.
Overall, great work!