Bug: if you have gaming mouse (e.g one with multiple keys) and try to launch game with it plugged, selection starts to move down extremely fast itself, like if you hold 'down' key.
Exists in demo, no idea about full game.

Why: it happens coz some gaming mouses identify here as 2 devices: mouse and gamepad. So - if game mindlessly tries to use 1st device, found - dragon appears.
https://bbs.archlinux.org/viewtopic.php?id=189901

Solution: add ability to select device manually. So: ever if game think, that your mouse is primary gamepad, you will be able to force it to dont think so. And game will work correctly