This was a super fun game, it felt like a whole game already!!
I really loved the art style and the sounds. The upgrade mechanic with the monster parts was a great addition as well. I really liked the shadow and light world mechanic, felt really unique for this kind of game. It's also similar to Downwell which was super fun to see!
I ended up buying the upgrades a lot and started one-shotting the enemies haha. Earlier on I thought they were too difficult because it took a lot of bullets to kill one, but after upgrading it was really great. I also really liked how it was a potion to upgrade which matched the alchemy theme.
I think I did notice some oddities when switching between the shadow and light worlds where enemies would fall through the floor but other than that, it was so so good!
Overall this game was great and super fun. Well done!! :D