Impressive indeed. I really am impressed with the use of colors and the smoothness of this game, considering the hardware it's running on. Quite some professional softwarehouses back in the 80's could only have wished they were able to do something like this.
Besides that: it also looks like quite a hard game! 
/me is going to hook up his Arcade Turbo to his Zemmix Neo :)
@Manuel probably in a new project XD actually the code is almost complete and I have really few remaining bytes.
I haven't played your game yet of course, but I do think the gameplay will be much more interesting if there is something to fight for except to survive or scoring points. Getting some rewards for your skills in the form of weapon upgrades is a success factor in most shmups.
But we'll see
On Tuesday I was as guest in a live streaming to show Freedom Fighter and to talk about the project. I showed the three unlockable secrets in the game:
- music test: you can listen to all the music of the game without the sound effects that "interrupt" the execution in channel 1
- spaceship selection: once unlocked this you can choose to play with the Freedom Fighter spaceship or choose one of the most famous for MSX (Zanac, Twinbee, Star Soldier, Star Force and Hype)
-cheats: max weapon level and spaceship collision deactivation
I also previewed the level 4 map (the map is complete but all the boss sprites and their movement/attack patterns are missing. You will not see the map of the fourth level in this video)
As said during the live the codes to unlock the secrets will be provided by the game, one at a time, when you'll complete it. Since the game (according to the MSXdev regulation) will be downloadable for free, who after downloading it will make a donation of at least € 1 to my paypal address will receive all three codes via email without having to wait (so my wife won't bother me again about unuseful coding if I'll be able to gift her something 
).
Very nice! The last boss is pretty cool! And looks quite challenging! Specially, the first time you reach it, those laser patterns are going to be hell! 