At the end of the first red and black level, it drowns in lag during the last jump and then when you try moving off the right edge of the level to beat it, you die.

This game could be much better, although this is your first game. Jumping too high makes you die, there's no real objective, and the levels are too short. Keep at it, though!

Glitchy and terrible art.

its functional at least, so that's good, but the controls are a bit stiff and often leads to your death by level 3

This is an OK game for a first experience on Flash, but it's unfinished content. I'm sure that you will get better, as long as you take into account the constructive critisism of the reviewers!

So, first of all I would like to point out that during the first stage of the game I was very confused. The textures created an uncomfortable feeling to me with all those dazzling colours. The main character suddenly appeared in a colourful world without any explanation or back story. Is this a stomach of a person and the Pea is trying to escape from the backside? Did someone drop some alcohol on the ground and the Pea became drunk? That would also explain the weird beginning.
The gameplay was decent though and very well suited for a platformer: the speed and jump height of the Green Pea Guy were well calculated. The movement was smooth too.
I have to say that the sprite of the Green Pea Guy appeared that it wasn't cut correctly and he seemed to be floating. You could have also added an animation when he was moving, if you would like. Make him roll on the ground for example. That would be very pleasant for the player and more humorous in my opinion.
The last stage of the game was glitched. When I made the last jump, the character froze for a few seconds and then teleported up on the last platform. The game didn't end when he was at the far right side, but insted he went back at the start because he touched the end of the screen.
Finally, I found very nice and player-friendly the fact that the character spawned at the start of the current stage and not at the start of the game when he dies. That was great!

Overall I will give you... 1.5 stars. Mostly because it's an unfinished project than a complete game, but I liked the gameplay nonetheless. Keep up the good work, I'm sure you will become better and I can't wait for your future awesome games!