We're the same age, and I was also in a basement band in '91 and totally bowled over by grunge.
You've hit it right on the head here! Your EP evokes Bleach-era Nirvana (my favorite era, I might add), peak Alice in Chains, and a host of other early-to-mid '90s bands.
The melodies are strong, the lyrics could sit shoulder-to-shoulder with any number of songs from that era, and the production was spot-on.
Nicely done.