just bad
Just because it's a celebration of pico day, there shouldn't be lower standards for flash. This was... just bad.
Graphics - Simple. Too simple. Looks like you were in a hurry to finish this with one good idea about implementing NG characters in to the game. The character animation has two frames, there's not gun shot animation, death animation is just a red blob... omg.
Sound - I could say something about the trance music but it's no use... but the game sounds? At least TRY to be a little more creative with them. Pico sounded like a pussy with that pea shooter
Gameplay - Your average defence game. Done dozens of times. But why in god's name do all the towers have identical range??
To improve, sit down and take moment to think about the game it self. Be a little more creative, funny and original. It's pico day for god sakes! This could have been sooooo much better and funny as hell.