Radirgy is a 2005 shmup about a schoolgirl flying a robot to save her dad from cyber-terrorists with a cel-shaded Y2K aesthetic and an absolutely bumpin' soundtrack. You push start, you choose your body (which determines movement speed), and your weapon (generic multi-shot, weak but continuous laser beam, and slow but damaging bubble shot) and off you go!

The main mechanic is the ABSNET Shield: You fill up a meter by killing enemies, which when filled, allows you to activate the ABSNET Shield, which renders you immune to projectiles, and temporarily removes all projectiles on the screen for a split-second after it deactivates. All the bullets absorbed/removed fill up the Signal meter at the top of the screen, which increases your score multiplier, up to a max of x16. The score multiplier fades with time, so aggressive use of the ASBNET Shield is encouraged to rack up those points and get that high score.

I don't play a lot of shmups (mostly because I'm god-awful at them), so I can't say how it fares compared to its contemporaries, but outside of the ABSNET Shield mechanic, Radirgy is fairly generic gameplay wise. You shoot, you dodge, you rack up points. It feels like a parody game you'd see in the background of an animated TV show. But the gameplay is tight and the vibes are rad, so if you have an hour to kill, there are worse things to do.