In QLZR, colored asteroids fall from the sky. You need to destroy them by firing the corresponding color from the magic amulets at the bottom of the screen, before the asteroids destroy your amulets. There are three levels of difficulty, each taking about 10 or so minutes to complete. The basic colors are red, yellow, and blue, but as the game gets harder you're asked to combine the colors to fire orange, green, purple, and combine all three primaries to fire black.
There are some obstacles like acidic shields on some asteroids that need to be popped before you can destroy them and an annoying chameleon may appear and change the color of an asteroid before you can destroy it. A fat chicken will sometimes appear to give you some powerups (shields, or a pulse that pauses time and destroys some of the asteroids on the screen). After a certain period of time, the final boss dragon appears shooting colored flame balls and you have to defeat it too.
The music and sound effects are fitting, the art is actually quite good. My issue with this game and reason for below average score was the controls.
I tried to play it with mouse and with touchscreen. The game instructs you to touch the necessary primary color to fire it, or swipe from one primary to the next (e.g. yellow to blue) to fire the mixed color (green). Playing with a mouse, this should mean clicking on individual colors, or clicking and dragging for mixed colors. What wasn't immediately apparent, however, was that if I clicked too close to the boundary between the two primary colors, I'd sometimes trigger the mixed color instead of the primary one I wanted. I didn't find this happened consistently enough to use as a shortcut saving me from purposeful mixing, so it just became an annoyance that would break my chain if I wasn't being exact enough when clicking to fire the primary color.
I actually found it harder when I tried to switch to touchscreen. For whatever reason, tapping the primary color did nothing. Instead, I had to carefully swipe just the one color I wanted to fire. If I swiped too close to the border between two primary colors... the same problem I was having when clicking showed up. I was able to pop the acid shields by tapping them, so it clearly wasn't an issue causing the tapping function to be completely broken.