In order to play Upgrade Complete, you'll need to buy a few upgrades. I recommend you start with a menu screen. It's not cheap, but the freedom it provides more than makes up for the price. Plus, it enables even more satisfying upgrades, like menu buttons. From there, you can upgrade your way to full-on sidescrolling space combat, complete with a customizable warship.
Upgrade Everything is all about empowering the player to design and achieve the ultimate game experience. Want more missles? A faster engine? Better graphics and background music? They're all upgradable. Everything's upgradable. And let me tell you, there's no better feeling than earning the very best spaceship virtual money can buy--and then getting an achievement for doing so because you paid to upgrade your achievements.