Thank you for the playthrough video! :D
It seems that you only figured at the very end that you can also shoot upwards (and you also missed one health powerup). :) There is a menu button, with game map (a typical metroidvania game style map), upgrades collected (which can be turned off and back on, like in Super Metroid) and a "main menu" part.
Nice to hear you had fun playing it. :)