Probably the best TD I've played in the jam great stuff! I liked the TRICK mechanic where overpowering a minion caused them to turn into a red ghost who then attacks you! Balance is always the most difficult thing with games like this, and the game does ok in that regard.
I found some of the SFX lacking or very repetitive, so maybe a random poo of sounds could be used for those repetitive actions, like the archers shooting etc. Early in the 2nd wave I seemed to have a bug where despite having 2-300 souls I couldn't click on any graves to summon new minions, and nothing happened when I clicked on my existing minions, so couldn't upgrade them anymore.
Besides that, going forward it would be nice to see more visual / SFX feedback when clicking on minions, choosing upgrades etc. to help with the feel and sense of satisfaction you get when playing and becoming more powerful.
A fun time.