Fun game! Seems like the pterodactyl position is based on mouse movement instead of the mouse position, so i ran into an issue with that after the first menu popped up where i just could move to certain areas. overall fun though and looked great!
Yeah, there's an annoying bug with Unreal Engine web games where bringing up any sort of menu "releases" the mouse. To fix this, you have to click on the game again after you've chosen your upgrade, and it should recapture the mouse.