Sad I missed this one in the initial voting period.
Very good incremental! Interesting concept, I like that there's a tangible endpoint, and the bats flying around the screen were a very charming touch that fit the theme of trick-or-treat style Halloween mischief perfectly.
The only things I really miss are:
-- The ability to zoom out on the skill tree - at higher upgrade levels it felt tedious to navigate.
-- I also would have liked to see commas or some other division in the numbers, as when I got up to 5 and 6 digit prices I started to have trouble telling them apart.
Missed the ending as I'm not on Windows sadly, but very happy with this game overall. Very well done!