Syder Arcade takes me back to my old days of MSX gaming in the 80's, when I used to play the Nemesis Saga games (Nemesis, Salamander, Gradius, and all of their sequels) with the MSX plugged to a color TV.
Syder Arcade does provide some of that feeling: the music is excellent, that sounds like the old 3-voices digitalized musics of the 80's arcades.
Another thing I liked is the default key controls: Z / X to shoot and arrow keys to move. For those who are unaware, the MSX keyboards had huge arrow keys, specially designed for games. I loved it!
However, there are some flaws.
1) It is not possible to leave the game in between phases, because the ESC key won't work until the game has started. So you are forced to go through the cut scenes between levels and wait until the game has started.
2) Unlike the games from the 80's, there are too many visual elements in the game and sometimes it is hard to tell between something that is "shootable" and something that isn't.
3) there are no hints or clues to what the difficulty levels are, since its names aren't very intuitive. Actually, there isn't a single hint in the menus!
4) There is too much story in the cut scenes. Sometimes I just want to get to business and start shooting. I don't care about the plot or the background story! I didn't care when I was 14, I won't care now!
Other than that and a few other minor flaws, it is a very nice game and I am very glad I got it. I've been acumulating hours on the game! I hightly recommend this game.