Did this in just under 5 hours:
6701 Fighter Wave (easy as level 1.
*Smg'Heed Theme* One ship enters at a time and not much in the way of (challenging) AI)
6702 Bomber Wave (easy, same as 6701)
6703 Supership Wave (easy, same as 6701)
6704 Assault Wave "Destroy incoming Capitol Ships" pops up (easy, 1 unprotected Capitol Ship appears like a sitting duck and doesn't even attempt to attack or defend itself lol)
6705 Fighter Wave (easy, enemies entering 2 at a time now)
6706 Bomber Wave (easy, same as 6705)
6707 Supership Wave (easy, same as 6705)
6708 Assault Wave "Destroy incoming Capitol Ships" pops up (easy, 2 unprotected Capitol Ships destroyed easily)
6709 Fighter Wave (easy, slightly more aggressive attacks & AI)
6710 Bomber Wave (easy, same as 6709)
6711 Supership Wave (easy, same as 6709)
6712 Pilot Episode (easy, as long as you have smart missiles and don't have to try and aim lol)
6713 Fighter Wave (easy,
music changes to *Se'Bab Theme*, fighters appear in threes (triads) and solely attack player)
6714 Bomber Wave (easy, triads attack player until last squad which go for star bases)
6715 Supership Wave (easy, triads attack player throughout)
6716 Assault Wave (easy, 2 Capitol Ships and up to 18 Fighters, one at a time, unless you take out both Capital Ships first)
6717 Fighter Wave (medium, Fighters appear in squadrons. New squads won't appear until all 4 current ships are destroyed. Attack the player)
6718 Bomber Wave (medium, same as 6717)
6719 Supership Wave (medium, attack both star bases and player)
6720 Assault Wave (medium, 3 Capitol Ships that start unleashing the smart missiles)
6721 Fighter Wave (easy, triads enter up to 2 sets at a time)
6722 Bomber Wave (easy, same as 6721)
6723 Supership Wave (easy, same as 6721)
6724 Male Bondage (easy, the sperm shaped ships lol. All 8 enemy ships enter at the same time)
6725 Fighter Wave (medium,
music changes to *Telchine Theme* and AI is focused strictly on star bases unless you hit a Fighter w/ a stray shot. Then, they'll attack the player exclusively)
6726 Bomber Wave (medium, most of the focus on attacking the player. A couple go after star bases)
6727 Supership Wave (medium, half attack star bases and the other half go for the player)
6728 Assault Wave (medium, 3 Capitol Ships & lotsa smart missiles)
6729 Fighter Wave (easy, four sets of 2 ship teams enter one team at a time)
6730 Bomber Wave (medium, same as 6729)
6731 Supership Wave (medium, same as 6729)
6732 Assault Wave (3 Capitol Ships and the (now) usual array of smart missiles)
6733 Fighter Wave (medium, attack in triads) I was destroyed during the 2nd entrance of enemies and lost a record setting 280 kills

After starting over and finishing the wave w/ all star bases intact, it gave me a 'bonus' of 1,817,880 points :0
6734 Bomber Wave (medium, more triads)
6735 Supership Wave (medium, appear in squadrons)
6736 Your Own Worst Enemy "Time To Die" pops up :0 (medium, 8 replicas of the ship you're using appear at the same time) I beat this wave in about 2 minutes and my bonus was 180 points
That's fair
6737 Fighter Wave (medium,
music changes to *Slith Theme* enemies appear in squadrons. 3 sets, first 2 sets attack the player, last set attack star bases exclusively unless you interfere or random laser diverts their attention)
6738 Bomber Wave (medium, enemies appear in squadrons) Had the 2nd set materialize right next to me and they were all firing straight outta the womb! It was full reverse w/ a 90° upward facing angle to send my ship on the only course these jokers can't calculate. Ahh, nice to have the moves down like they're second nature
6739 Supership Wave (medium, enemies appear in squadrons) After getting killed and restarting, my flawless victory yielded a bonus of 4,043,371 points :0
6740 Assault Wave (medium, Capitol Ships, smart missiles and very aggressive attack squadrons)
6741 Fighter Wave (medium, up to 3 sets of 2 ship teams entering at once. Getting vicious!)
6742 Bomber Wave (medium, same as 6741)
6743 Supership Wave (medium, same as 6741)
6744 Assault Wave (medium, 4 Capitol Ships w/ all the trimmings)
6745 Speedkill Wave (easy, up to 6 Fighters, 2 separate entrances)
6746 Bomber Triad Combat (medium, an array of different races w/ the Telchines doing the most damage this round)
6747 Triad Wave (medium, all Bombers attacking in full force)
6748 Blast From The Past (medium, same 1950's ships from Wave 6696 and every bit as difficult. All 5 enemies enter at once)
6749 Fighter Wave (medium,
music changes to *? (unknown title)* and they're seriously not afraid to unload some fire power)
6750 Bomber Wave (medium, attacks are focused on the player w/ more and more pilot ejections happening, further complicating the task)
6751 Supership Wave (medium, attacks and fire power at a high level-and I don't mean mine :0 )
6752 Assault Wave-Right after starting, the game crashed with a messed up screen, reset the console and all progress lost :0 Time to start over.. again lol.