Treasure adventure game free on GOG

But thanks for sharing anyways because I didn't know either!

There's actually several indefinitely-free games on GOG. I recall them auto-adding to new accounts in the past, so either I'm misrecalling that, or they changed how it works. Either way, if you sift past the demos and DLCs on that page, you should be able get a bit over a dozen free games, a handful of them being rather good.

It's extra-relevant now to know that it's free, because if you own Treasure Adventure Game then you get an extra 5% discount (10% off instead of instead of 5% off) for pre-ordering Treasure Adventure World