This was quite enjoyable! I love a tactics game and I think this concept would be a good one to keep fleshing out. I like how the enemies and the player teams each shared a pool of actions - this changed up the strategy quite a bit. It wasn't necessarily a good choice to have a ton of teammates since they would mostly do nothing. But since player death is permanent, you need to have a bit of a bench (and they can die really suddenly). It hurt when my fully upgraded attack bowman got instakilled. Also it makes the enemies more dangerous when they have fewer people to fiddle with.
The UI was a bit overwhelming, but the on-demand help was very good. Two things weren't super clear in the UI - you have to drag and drop the character (I expected a tap and tap). And then the upgrade menu required only one click to sink a pearl, and I wish it had a confirm prompt.
I really enjoyed playing. The movement was unique (and I have a bad memory, but I know chess and ened up with only a few characters left to memorize after the others died lol). Also seems easy when you can have super bowman run around and kill things at range, but eventually the terrain gets less favorable for the bow and the enemies ramp up, so seems like you had some good balance cooked in.