it's nice. rough around the edges in almost every way, but it's got that flash game charm. the mini-hakkero being mouse based reminds me a bit of the platforming in No Time to Explain, with the player controlling closer to Celeste. a nice foundation.
dunno if i'd go so far as to call it a rage game but, as others have said, that last room's demandingness chafes hard against the game's flaws.