No bugs in co-op? Woah, that's pretty insane. I played SEV2 with my dad as a kid and we loved the co-op. It was buggy as shit but it was so much fun.
I'm definitely gonna look up gameplay of that level, because I'd love to get a better SE experience. I felt like 4 was kind of incremental upgrades from 3 so I thought 5 would be more of the same. Maybe I was wrong!