At first I wanted to say that the game is hard as dicks, cause there is no indication if you're approaching a house too fast, but then I read your comment about the bat's facial expressions, and it became a lot easier, I almost completed the level, but kept crashing in the maze, and after dying lost interest.

I have the following suggestions:

• Add the houses to minimap. Cause otherwise is entirely possible to miss one and not have enough blood.
• Flip her sprite when she's flying to the right. Cause now it looks like she's flying ass-forward.
• I'm gonna agree that the hitbox doesn't match the sprite, as I often crashed when it looked like there was still some space between it and terrain left.

I found this game to be quite difficult kek. As Donpommelo mentioned it would be helpful to have some sort of indicator of whether or not it is safe to land. There were several times I thought I was moving slow enough to land and was quite mistaken. 

I assume you intend to add some sort of terrain that is more than a white line so I won't say too much on that, my only real gripe about the scenery is it is easy to get lost when you lose sight of the ground/buildings. the first time I came to a large drop I wondered if I had gone off the edge of the world. Then suddenly, BOOM, smack the earth.

Personally I wish there was a way to rotate faster sometimes.  Perhaps the mouse could be used to rotate somehow? thus giving the player finer control.

As I said it is a difficult game (at least for me), but it is satisfying when you start to get it.

++Shoutout to fellow SDL chad!

• Would be nice to have some sort of visual indicator of whether the player's current orientation and velocity would be safe for landing before the player actually lands
• Flying straight right from the start at full speed seemed to get the player stuck with the parallax background scrolling to the left and I could not return to the title screen without closing the game. This also happened after flying over the initial wall left from where the player spawns
• The player's hitbox often seems to not match up with their sprite, but this was often in my favor (landing a little to the side of a house) so I won't complain
• When higher up in the air, I would sometimes lose track of my velocity without any houses or walls on-screen for reference.

a fun challenge once you get used to the physics and controls

Alright, tried it out.

My main takeaway from this is you made a very crudely-realized yet surprisingly playable game about your waifu.

You're basically the Motomu Toriyama of /agdg/. Take from that what you will.

haven't played this yet but vampire girls are hot so i'm gonna give it a try. i'll let you know what i think