Thanks, I'm glad you liked the game!
You can enable slow-mo (options/controls/key bindings) to train beating the lord. Hope you'll enjoy episode 6 which is special
What about my plans, the next update will add gamepad support and co-op mode with split screen where the 2nd player controls a friendly turret. I think this will be one of the last updates. I hope someday I'll start making "Railjump 2" with more complex level design, considered plot and lore, variable upgrades, better animation and more content generally, but I need a team for this