i'm still deciding between two artists here and talking to artists from other sites with art style that I think will match what I have in mind for the game
@Jhrawr, it's not final yet but there would be probably be around 12 buildings in total in the end, most have upgrades but upgrades do not require graphic changes. Right now though, I just need to finish the buildings for the first stage. About 6 buildings should be available at the first stage.
For the invaders, I need 4 types of invaders at the first stage: 3 normal ones with different behaviors and one boss-type.
@kreig13, the stage size is 600x550 (600x450 of which is for the actual level game map and the bottom 600x100 is for UI). The ground is divided into 'grids' of 25 pixels. Most buildings take up 1 grid of the ground, thus 25 pixels in width. Height is arbitrary. Some buildings take up more than 1 grid though, like the Capitol which takes 2 grids (50 pixels).
@armagedoom, not yet, I'll get to music and sound effects later.