Looking for name of a really obscure game

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I just remember it was from top-down perspective, the game was a very huge semi-randomly generated dungeon with several bosses.

I think player's abilities were something about holding down a button which made some ring-like ability grow larger and destroying/reflecting enemy bullets.

After every boss all normal enemies got buffed and the floor's background color changed. At the last boss the floor became pretty epileptic.
Had pretty cool music too.

My vague memories would say the game's name ended in "um" and it was a single word. (possibly had "the" in front)

Some freeware shit and I doubt anyone would find it but who knows...