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Aah this one is better than previous one of course :)

Anyways, I've explored deeper and gained more upgrades. Still looking for last upgrade(s). Speaking of which, I've spotted two hearts. I've taken heart in room with mini tunnels however taking that caused the other heart (in tall room requiring wall jump) to disappear. Is that a bug or player can only take one or the other?

That appears to be a bug. I had an issue earlier on in the design that caused the hearts to vanish when reloading a save file as I was saving/reading the wrong flags to indicated which had been picked up. Thought I'd squashed it, but apparently I didn't quite get it! Thanks for the heads up, I'll be sure to look into it for any future updates.