I had a ton of fun with your game! This was very well designed, props to you!
The graphics and music all gelled nicely with the satanic theme and got me really pumped up to shoot the evil beasts that lie ahead! I like that you implemented the bullet hell screen scrolling in this new way with the car on the road, seems pretty innovative to me.
The gameplay itself was solid, I mostly felt that getting hit was my own fault (I think the ship should have a slightly smaller collision box), and the amount content you fit in already was pretty baffling to say the least. The different enemy types, the multiple bosses (I didn't quite make it to Satan :( died on the road after crab man), and the whole "whatever doesn't kill you makes you stronger" mechanic made it feel like I was progressing through the game and getting rewarded for my efforts.
The only gripe I had was the lack of sound effects, especially for bullet shots and taking damage, but if you had gotten everything into the game within a few days people might think you were inhuman! ^^
Very well done!
~Jack Soulie