Nice variation on a popular mechanic. I didn't catch what the difference (if any) between the tile types. I recommend making a bigger show of it when the player dies (or the end runs).
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All the types only give you power which is converted to either attack, defend or heal. I thought about adding different types of power ups or power per tile, I just was trying to balance everything it was getting quite heave on systems lol. I will probably revisit the design again some time, thanks for playing and thank you for the awesome feedback!