Sweet retro goodness !
I really enjoyed the music in this one, those are some chiptune bangers, the spritework for all the jets, helis and boats are also very well done. This has a sort of Raiden mixed with 1942 sort of vibe to it which worked quite well.
THe multiple phases of the boss also feel very satisfying to destroy, and i like the fact that the enemy planes attacking during the boss are telegraped by showing them take off on the carrier runway, a very nice attention to detail.
my only slight gripe is that the base enemy bullets (the small red ones) are a bit too small and thus can catch you a bit off guard at times.
Other than that no real issue with the game this is quite solid for a jam entry as well.
Great job :)