So, a few things after having played this for a bit. The initial grind is way too much. Doing the exact same thing eight lives in a row with zero progress solely to accumulate the currency is just boring.
The eye minion upgrade and an autoclicker is basically required to make progress at any decent pace, with all the other initial upgrades completely paling in effectiveness.
Regardless of whether you have the clicker minions or not, it's a very hands on experience and not idle at all.
You can only summon a boss while the enemy is dead, which means that the more upgrades you have to decrease the time between enemies, the harder it is to summon a boss.
If you've got the clicker minions, chances are you're either spam clicking or using an autoclicker during bosses, and currently when they die that usually results in accidentally skipping through a bunch of dialogue.
No gallery feature - you can only see a scene by doing a run again, and you're forced to see every scene every run (up to where you can get to, that is, it's painfully slow progress to actually get more than a couple scenes).
If you upgrade the enemy respawn too many times, the enemy stops respawning altogether, completely soft-locking the game, with the only solution I can see being deleting the save and starting over from scratch.