Thank you for playing and reviewing my game! This feedback is super helpful! Yes the summon order is quite subtle, I'll look into making it clearer or repeat even. The losing all your souls on a failed summon is brutal as mentioned by a few other reviews and this is something that I'll change.
More juice is always something that needs adding, i have a few more ideas to implement.
The lag is the main issue i'm currently trying to resolve. Great idea about pooling enemies, this is something I always hear about but never knew how to implement but you've explained it super clearly, I'll look into this! Thanks again for giving my game a go :D