Not really understanding the negativity. Previous Madvents had broken and unfinished games too, as would be expected from what it is: a collection of small games put together by devs of wildly varying experience levels in a short time. Quantum Reindeer is an absurdly well polished outlier.
Frankly, it's a miracle things like this get made at all considering organizing unpaid devs is often compared to herding cats. I, for one, appreciate the work that goes in to giving me a free little digital treat to open every day of December.