I really enjoyed this! The art for all the characters and beasts was great and I found the combat quite enjoyable, if a little difficult. I apriciate theintention of having your party regularly cycle through monsters - I was having the most fun while trading blows in a large fight and filling in the gaps in my line as monsters fell and were replaced. However, it took me a while to kind of click that this was the point, and I was always getting attached to creatures, which made loosing them feel extra frustraiting. same with the loosing of spent beast mana and equipment. Some setting up of expectations in that regard would probobly address any hard feelings because the game loop you are going for is a good one. One final thing; more than once I spawned back at town after being defeated with zero monsters on my team and it felt like a real struggle to build back up - I found myself trying to cheese things by grinding on easy to build a party, allowing myself to get knocked out while setting all my monsters to guard, so that I could spawn back at town with a full party, gear them up and go back in on a higher difficulty.
All in all, a very lovel time! The art was the star, for me!