Yeah Jamestown+ is a lot of fun and I really like the fact that everything is 2D pixel based, even the menus, makes for a more legit feel.
Caladrius Blaze looks like it could be fun, I played the 360 briefly, just borrowed it for a bit, you can download it 20 bucks on XBL but it's no Blaze.
I want to get Resogun, looks like fun, I love defender. Another game that plays like Defender but it's an indie it's the Cat Milk Mine Defender or something like it, it's super fun, I love it! Another game that uses 2D pixel art for everything but the rez changes, still a great game though. Excellent for Co-Op.