This game looks amazing on screenshots, and seems highly regarded. Also, it looks a bit like R-Type.
After some configuration frustration, I figured out a few important facts about the mednafen emulator:
You configure controls by pressing alt-shift-1 (I usually remap those in Windows to switch keyboard layout, which confused me a lot),
it needs fully expanded paths on the command-line,
Error messages only go in a file 'stdout.txt' next to the executable.
Argh, the shrillness of the sound! I'm going deaf if I want to hear the music. Luckily, there is a config setting:
, which adjusts the non-CD audio when playing a CD game.
A volume of 10 seems reasonable.
STAGE 1 BROKEN!
The dash mechanic is excellent - when you need to get out of a sticky situation, you hold in a direction and press button I. Then ship dashes super fast in that direction. More games should have that.
In the first level, you are defending big carrier ships from attacking bio weapons. A certain type of enemy fly towards the carriers, and if they are not destroyed, they will attach themselves to the hull and start shooting like turrets. That's a really cool idea.
STAGE 2 BROKEN!
Another mednafen config tip:
enables crisp pixel scaling, if you're into that sort of thing.
After 'breaking' Stage 2, Stage 3 shows another neat trick: a top-down perspective into a deep chasm. Gameplay is unchanged, the sprites are just top-down.
The soundtrack is pretty cheesy...
STAGE 3 BROKEN! Important fact about the climbing boss: its legs doesn't have collision on it, allowing you to pass through them and attack the power core or whatever using a backwards red weapon. The upwards red power-up was useful against the final boss. In the first phase, I could just stay directly below its lower front part, attacking it with the red weapon, and move up whenever the green shots get close. The second phase is just a constant attack and dodge.
I played a little bit of this on the MiSTer. The soundtrack is pretty awesome.