Thanks for playing! that is a monster score and about as good as im able to do and I've played the game a lot.
some indicator for combo timing and enemy spawns is a good idea and is on the list for polish. the spawners dont reset when crossbow guys arrive, each spawner randomly chooses a spawn delay per spawn between a max/min, both of which decrease as the kill count increases. it may be dumb luck causing a lull in the fight but still doesnt sound like good news.
Stacking 4 of the same spell and sacrificing some versatility for more power up stacking was an intentional decision but it is way too good. i always just pick 2 spells to use.
Thanks again for the feedback my friend.