Oh, crap. What a game. I made it all the way through to the end. It gets so intense, but never unfair. Add the visuals and the thumping music, and it's quite an experience. Very much like a classic shooter. It reminds me of Super Aleste/Space Megaforce, but in 3D Tron visuals. I turned bloom off after it made me lose at the end of Stage 4. It yellows out the whole view on the boss part of it. Sucks. I still haven't tried the other filters.
After you beat the game, you get this Beyond option to open up. It lets you play the game for score all in one shot (across the stages, rather than one stage at a time). That was the last thing I tried, and I almost made it. Got very far into Stage 5, then got creamed. I'm not sure, but it seems harder too. I have the replay of that going now. (The whole 50 minutes I played got saved. Nice feature.)
What system is this from again? It must have made quite a splash in its day. It's awesome even now. The normal Rez, which you can play here too (and I did try it) feels just as good. The music is the only thing that seems to lack.
Edit: That's wrong. The music is exactly the same, in 2-channel stereo anyway. I think when I first played the standard game, I chose a stage where the music starts out very slow and sparse. Maybe that's why I got the wrong impression.
Oh, and all the tacked-on visual filters suck, some more than others. I'm done with them altogether.