Currently there's only one level and the cart will simply replay it once it's completed.
I hope to add another one in future, but I also wanted to get something out before the end of the decade, and I have.. 19 minutes (local time) to do that!
Controls:
Z: toggle landing gear up down
X (while landing gear is down): throttle up
X (while gear is up): fire rockets
Arrow keys: move
Shift W Pause menu option: minimap & mission briefing
Repairing & refuelling
Find a repair crane and land nearby - there's one in your base!

Rescuing friendlies
You can find hostages and other folks in need of help dotted around the map. Land nearby and they will hop on board! Bring anyone you find back to your base (the yellow objective marker) to complete the rescue.

But be careful - if you are shot down or run out of fuel with passengers on board, you will not be able to rescue them! (ran out of tokens to fit that in, sorry)
Non violence mode
You will still get shot at, so it's not 100% violence free, but I wanted to include a less bloodthirsty way to complete a mission. Non-violence mode is active as long as you don't kill anything, and you don't get killed. You can complete the level by rescuing all friendlies on the map.
Once something has been destroyed, you will need to complete the main objectives to finish the mission.
And Happy New Year!
edit: I completely forgot to credit Allister Brimble as the original author of the music - the track in this game is a manual conversion of his Zeewolf 1 title track.
old versions: