TouchArcade: Pixel art fans might want to check out a game which came out last night, Combo Queen [$1.99]. Not to be confused with the recently-released Combo Quest [$0.99], this is a game that's similarly about rhythmic, tap-based combat. You have to tap on enemies with a certain rhythm in order to do damage to them, with a pattern that speeds up with each hit in succession of three hits. Mastering this timing, along with the timing of enemy blocks, will be the key to success. It's a game with a rough learning curve, as there's not very generous timing windows to hit enemies.