Absolutely. It's a little draw out: you have to apply for a refund, Itch will give you the boilerplate that they normally don't do refunds except in cases of deceptive marketing/non-functioning games etc, I'll reply-all on that giving my permission and they'll issue the refund. May take a few weeks (mostly because they're slow to respond, and the process waits on them twice) but you're certainly welcome to, and I'd be glad to approve it.
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No problem. And correct, you'd have to buy again. I mean, the download is a file on your system, I can't really control that. But if we're working on the honor system yes, you'd delete and re-buy when/if interested.
I may not come back to this threat to remind you, but you should get an email from Itch once it's gone through the whole system confirming the game has been refunded. And again, brace yourself for a wait, it's whenever Itch gets around to answering emails, twice. So could be three or four days, could be a couple weeks. I'll try to keep a close eye on my email so I can respond promptly though.