I emulated the original Saturn version. It definitely has a great vibe, and the soundtrack, especially the first episode, is really cool.

It's pretty difficult I thought, I was planning to not use save states, and I made it to episode 5 without them (meaning I got a few game overs and had to beat the first few levels several times), but eventually gave up on that (just used them to get unlimited continues though, didn't save state mid-level). There are multiple buttons to shoot, and it definitely feels like it was designed to require the player to kind of drum on two fire buttons so they can shoot down incoming attacks faster and not die, at parts particularly in level 5

Cool game, after a little break I'm planning to continue onto 2 and then Saga