Thank you really much for taking the time to play Atomic Cathode and do a Let's Play.
This game is one of a series of prototypes I am creating every month, with the purpose of iterating different ideas really fast. A full-time job prevents me to work more on them than I would, forcing me to sacrifice things like polishing and a proper playtesting, and bad results can happen like the frustating boss you were mentioning and the unexpected crash at the end.
I can say for sure that I am still satisfied of the result, that you enjoyed the game and you still recommend it!