 If you liked Cowboy Bebop: Tengoku no Tobira |  ...then you might like Dirty Pair: The Movie |
Each of these movies can be viewed as extra-long standalone episodes within their respective TV series. As for the direct similarities: they're both sci-fi action flicks with memorable soundtracks (80s pop-rock in Dirty Pair, modern jazz in Cowboy Bebop) and animation quality reflecting the higher budget of movies compared to individual TV episodes.
report Recommended by Quetzal_dactylus