I adore this game - the art style is goddamn gorgeous, really reminds me of old school PC games where they were always experimenting with new and usually very physical looks - specifically Neverhood.
The flying and shooting gameplay feels incredible, it took me a second to understand the controls but once it clicked I literally had this "oooohhh" moment where I was blown away by how good it felt
My only criticism is the checkpoints - I honestly think they kinda ruin the game, I didn't realize they existed in my first playthrough, flew around for about 5 minutes having the time of my life and then had to reset to read the instructions and actually work out how to beat the game. Once I knew what I actually had to do the game was over in about 30 seconds and I felt kind of disappointed, I think this game would be much stronger if you made the enemies a little harder and make them spawn more, then make it a survival high score attack style game. Players need time to enjoy your controls, combat and art!!!
But ultimately my only criticism is "it's too short" which hopefully you take as a massive compliment.