Huh. Not sure why fullscreen isn't working, but I'll definitely look into it! As for the controller issues, all I can really do at this point is apologize; the in-game support isn't great, I know, and I'm not experienced enough with doing controller support to make it much better, but I'll also give it a look-see and see what I can do.
EDIT: So, I've pushed a new update to the game. Hopefully fullscreen will work now, and navigating the menu/dashing with controller will be easier! My apologies for any inconvenience, and I hope you continue to enjoy Strike II!