At first it seemed surprisingly nice. It ditches the standard vertical or hori scrolling in favor of a Defender-style approach (or Fantasy Zone, Uridium, or whatever similar classic you can think of). Also the visuals can be really nice and detailed, and there are tons of explosions, especially with all the mines floating in the very first stage.
Then, however, it quickly begins to fall apart.
The game is riddled with tons of bugs and other nuisances. The third survival stage doesn't end after defeating the last enemy. The second survival stage doesn't end after the timer hits zero. Some gamepads aren't recognized. Enemies sometimes jump across the screen for no reason, occasionally flying straight into you for a quick and cheap death. Enemies don't appear on the radar. Items float above or below the playing field. At two times my spacecraft would constantly fly either upwards or leftwards for no apparent reason. The four ships are extremely unbalanced.
I could go on and on, but I guess you get the gist.
There is a decent at best shmup buried under tons of bugs and other shortcomings.
Too bad Steam isn't exactly brimming with great shooters, but if you're looking for an alternative, I'd recommend Jamestown.
Syder Arcade has its moments. Moments where everything falls together, works properly and where you can sense some creativity, so it's not necessarily a terrible game, but when having to choose between a thumb up or down, I'd go for the thumb down.