This game seems very broken.
Not only it seemingly freezes when hitting a "lump"
(un-fullscreen gets the game to recognise the hit, sometimes. Sometimes I have to repeat but not without fullscreen-ing again first. But anyway it always takes 30 to 60 seconds at best) but also trying to save in a slot that aready was saved on it then instead saves in the slot I saved the first time. WTF?
And I do not find any saves anywhere so I could delete no longer used save/slots.
And it may be ultimately broken as in it does not recognise me having taken the Dungeon Key. Two accessible doors still say I need a Dungeon Key, and that is that - no progression possible.

It also never was visible in inventory.