Unfortunately, I didn't beat the boss... I always loose track of him and I get stuck I think in the corners? Don't know exactly. However, I know how to hurt him so...
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Hi! I've just published a new update for the game: v0.5.6
This fixes a bug during the boss fight where sometimes the boss actually broke right through the wall and became impossible to target anymore. I'm very sorry that you were probably hitting that bug, but it wasn't your fault! If you're interested in trying it again, you can teleport directly to it instead of needing to play through the entire game again first. Just start a new game, pause, and then navigate to Debug > Teleport to boss.
We believe in you, but if you still have trouble, we're also planning on adding an entry to the Hint Totem in that room to skip the boss as well, so players can still experience the epilogue. Best of luck, you've got this!