Great submission! I was a little confused at first but the game was really goof for figuring new things out every time i played! Once i figured the loop out i was unstoppable! (untill i died). I played through a couple of times and got a little further each time. I think you said in a reply that you had lots of ideas and wanted to implement a shop system, I think this would be really good and build well on the core mechanics you have already implemented.
I thoguht the pixel art was very nice. especially the vines wrapped around the health bar and the pumpkins. The effects of the seeds turning into pumpkins was very satisfying too, especially when you had a bunch of them and watched them all change in a row!
The enemies that shot you had just the right level of frustrating behaviour. They always seemed to just dodge away, but it was really satisfying when i finally managed to group them all up and mow them down.
The music was nice and fit the atmopshere well witout being distracting.
Great job!