Played through the entire demo and it was great, took me some time though, got filtered pretty hard by the bigass chainsaw boat. After looking through the database I really want you to make a comic about these guys, if you ever do a kickstarter, consider doing so as a stretch goal. Just as other people have reported you can consistently get stuck in the corner by the healthbar.
I only have one pointer, you can slow down during the bossintros which I would remove.
Also sorry to inform you that the final demoboss is now officially mygirl.tm and as such you cannot marry her.