I really really enjoyed this, there is so much to this. You've found so many clever ways to explore the core mechanic, and there is a nice sense of discovery as levels progress and new tools get unlocked. The art looks good and everything feels great, and I like that the player's mode of attack is to frantically bash little enemies with a rock.
It was not at all clear to me that your warriors get delivered in breakable boxes that you need to open first, and I was nearly about to call it a day with the game when I couldn't figure that out - luckily I did eventually think to try that, and after that everything was verry intuitive. The combination of tougher enemies and little flies that you can harvest more gloop from is great.
Unfortunately level four completely beat me, the spiked enemies are in my opinion far far too difficult. They take your warriors out in seconds and I couldn't figure out a way to stop them from sending the spike. In that level, your only warriors are ranged as well, and getting a second takes far too many coins to obtain. With better balancing though, I think I would definitely have wanted to play all the way through and I'm sad in fact that I couldn't make it past such an early level to experience the rest. (I'd definitely be back to play a post-jam update if this was addressed!)
Overall fantastic job, the game design in this is wonderful and so charming.
One last thing I'd note is that the concept (haunted boardgame) didn't really come through to me. Perhaps I don't know enough boardgames that use little toy gatcha machines. I think more could be done to style the background like a boardgame, even if it's largely just around the edges, like a ring of boardgame tiles, or the faint indication of a playboard with the heart at its center.