I'm sorry if I don't have a lot to say, but this game is fun! Unfortunately, I forgot know there's a pause button and never shown in the video, but I had a blast on this one.
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. :)