Honestly, I find that it's well worth the $100. I don't know if I'd pay high dollar for it ($150 or so) but it's easily worth the $100 if you're a hardcore shmupper. For those of you who are wondering, it's a horizontal shmup, slightly reminiscent of Thunderforce 3 in gameplay style. The bosses are VERY easy, but the levels get fairly challenging toward the later stages. The weapons are excellent, with a wide variety, and the graphics have some VERY impressive parallax scrolling.
The thing I found most interesting about Gleylancer is the option configurations. The game allows you to gain 2 little options that follow you around like in the Gradius games. However, when you start a new game, you select the formation they will be in for the WHOLE game. There are something like 8 formations, and depending on what formation you choose, your strategies and gameplay will be radically different, as you can't attack the same way with many of the configurations. It's a well-designed horiz shmup with moderate difficulty, great replay value (for a game that has the same enemy patterns all the time) and excellent control.
As for the expense, it's one of the top priced shmups for the Mega Drive. The other two that I can think of (excluding Panorama Cotton) are Eliminate Down and Slap Fight. Eliminate Down, while very cool, is UNBELIEVABLY hard, so hard that it's almost unfeasible, and it still runs around $100+ a copy. Slap Fight, the next one on my list, I've yet to have seen for sale....EVER. Gleylancer is the easiest of the three to get (though still very rare) and definitely the more well-rounded of the high $ MD shmups that I've played. I hope that helps you a bit on it!

Too bad you're not closer, I'd invite you over to play it!
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