Thanks @40wattstudio!
Ran out of steam this evening and drink but still managed to get a few things done.
The question marks in the screen above are the raider type enemies. They've got a question marks associate with them in editor as there sprite is assigned randomly at the start of the game.
I also managed to get a few new enemy types in to help spice things up a wee bit. First off is the classic UFO enemy type that flies across the top of the screen shooting down at the player. The second is a little wee bouncy shite called the Bouncer. This enemy is designed to keep the player on their toes as it can come from any angle and a hit from this thing is instant death.
Tomorrow I'm going to focus on the scoring system and the HUD. I'm going to leave out explosions for the time being as I'm not sure how to do them yet without making the game look all muddled. I'll probably leave them last when I'm polishing up the gameplay. Instead, I'll focus on the roguelike elements next as well.