The logic for this game falls apart once the hearts appear. The idea is that they measure any "lonely" pixels. The problem is that, on some levels, the numbers recognized touching pixels in the opposite direction and sometimes they don't. For example, if a column is topped by a 0 heart, it isn't always accurate if a row has touching pixels.
Sorry, it's hard to explain, but it's a frustrating result from an enjoyable game.
I really like the design of the ships, weapons and enemies. They all have a very unique look about them. Love the upgrading. Needs a pause feature as well as the ability to mute the sound effects in addition to the music.
Fun game. Like others mentioned, a pause button would be great. Also a way to mute the sound and maybe some way to see how far along you are to your goal.