I think the game looks really pretty and i feel like theres a cool concept here but there is nothing stopping you from just spamming, it feels as though it is hard to make any strategy around the different troops. I think an important thing you could change is how they target troops, feels like they were changing at random sometimes. I tried sending the slimes in first to tank so that the devil would live to the end but the towers would just switch targets to the devil instantly.
Cool art, cool concept, just needs a little more strategy behind it.