ummm

Nothing too original or fun, I mean there are millions of Simon games and if you want to make a remake than do it on a better game than Simon says or at least try to make it original.

simple

It's a simple game, nothing original and it functions well.

Some recommendation would be music
Also to make it more apparent when a color is being lit up, I played without sound and had a hard time distinguishing between a color's normal state, and when it was being lit up for the pattern.

Another thing to make it more of a game is to create something original with it, for instance a different form of gameplay. Maybe even a time clock which time depends on how far along the pattern you are.

Last thing maybe create it so you can also use selected keys to hit a color, instead of having to always click it.

Ugh

So addicting...

Delivers what it promises.

Nothing really original. Good if you like Simon.

needs sound

maybe you can add some music or sound effects for pressing the buttons and things like that.
also needs an intro
you can increase the difficulty while the game goes on
make the lights flash faster
or give it a twist by changing the pattern